Study of Ultra-Fast CD19 CAR-T Therapy for Refractory SLE

Inclusion Criteria: * Age: ≥ 5 years old, and no gender limitation; * Diagnosed with SLE according to the 2019 EULAR/ACR SLE classification criteria, and still in moderate to severe disease activity despite ≥3M of high dose glucocorticoids(prednisone≥1mg/kg/d or other equivalent amount of other steriod), hydroxychloroquine and at least 2 DMARDs(include cyclophosphamide, mycophenolate mofetil, azathioprine, methotrexate, cyclosporin, tacrolimus, sirolimus, leflunomide, telitacicept, Beliumab, and rituximab) or intolerant to standard treatments; * SLEDAI-2K score≥8 points; * The functions of important organs are basically normal: 1. Cardiac function: Left ventricular ejection fraction (LVEF) ≥55% with no obvious abnormality in electrocardiogram; 2. Renal function: eGFR≥30mL/min/1.73m2; 3. Liver function: AST and ALT≤3.0 ULN, total Bilirubin (TBIL) in serum ≤2.0×ULN; 4. Lung function: no serious lung lesions, SpO2≥92%; * Meet the standards of leukapheresis or intravenous blood collection, and no contraindication for leukapheresis; * Negative pregnancy test for female subjects of childbearing age, and agree to take effective contraceptive measures the first year after CAR-T infusion; * Participants or their guardians agrees to participate in the clinical trial and sign the informed consent form which indicating that he/she understands the purpose and procedure of the clinical trial and is willing to participate in the study. Exclusion Criteria: * Central nervous system (CNS) disease: CNS neurolupus requires intervention within 60 days); * Severe acute nephritis: patients who have accepted or was undergoing renal replacement therapy within 3 months prior to transfusion; or in the investgator's opinion, patients who is likely to have significant kidney disease within 3 moths of the study which need high dose glucocorticoid (prednisone dose≥1mg/kg/day or equivalent amount of other steriod), cyclophosphamide, or mycophenolate mofetil treatment; * Have a history of congenital heart disease or severe arrhythmias (including multisource frequent supraventricular tachycardia, ventricular tachycardia, etc.); or combined with moderate to massive pericardial effusion, serious myocarditis, etc; or patients with unstable vital signs who need hypertensive drugs; * Uncontrollable infection, or active infection that requires systemic treatment within 3 months prior to screening; * Received organ transplantation or hematopoietic stem cell transplantation within 3 months prior to screening, or ≥Grade 2 GVHD within 2 weeks prior to screening; * Hepatitis B surface antigen (HBsAg) or hepatitis B core antibody (HBcAb) positive and peripheral blood hepatitis B virus (HBV) DNA titer greater than the normal reference value range; or hepatitis C virus (HCV) antibody positive and peripheral blood hepatitis C virus (HCV) RNA titer greater than the normal reference value range; or positive for human immunodeficiency virus (HIV) antibodies; or syphilis test positive; * Suffered from macrophage activation syndrome(MAS) within 1 month prior to screening (except for those whose safety risks have been ruled out by the researcher after treatment); * Received CAR-T treatment (except for those whose safety risks have been ruled out by the researchers after treatment); * Suffered from active pulmonary tuberculosis at screening; * Received live vaccine within 4 weeks prior to screening; * Positive in Blood pregnancy test; * Previous or concurrent malignancy; * Patients who participated in other clinical study within 3 months prior to screening; * Any other conditions that the investigators deem it unsuitable for the study.