The invention relates to a medical device, in particular to a medical bedridden patient rehabilitation training device. The device comprises a body support box, a leg training box, a belt tensioning box and a weight adjusting box; the problems that patients suffering from hemiplegia, a stroke, cerebral thrombosis and other diseases need to lie in bed for a long time in a hospital, thus muscle atrophy and myasthenia symptoms are caused, and the patient lying in bed for a long time need to conduct rehabilitation training can be solved, and the problems that an existing rehabilitation training device is simple in structure and monotonous in function, the safeguard procedures are few, and the patients fall over in the rehabilitation training process to suffer from secondary injury are solved.