The hemodialysis machine can be roughly divided into two parts: the blood monitoring alarm system and the dialysate supply system. The blood monitoring alarm system includes blood pump, heparin pump, arteriovenous pressure monitoring and air monitoring, etc. The dialysate supply system includes temperature control system, liquid dispensing system, degassing system, conductivity monitoring system, ultrafiltration monitoring and blood leakage monitoring. Its working principle is as follows: dialysis concentrate and dialysis water are prepared into qualified dialysate through the dialysate supply system, and solute diffusion, osmosis and ultrafiltration are carried out with the patient's blood drawn from the blood monitoring alarm system through the hemodialyzer; The acted patient's blood is returned to the patient's body through the blood monitoring alarm system, and the dialysis fluid is discharged from the dialysate supply system as waste fluid. Reciprocating continuously to achieve the purpose of treatment, complete the entire dialysis process.