Function rehabilitation training device for knee joint of knee amputation

According to the key points of the technical scheme, the knee joint function rehabilitation training device comprises a first mounting plate, the lower end of the first mounting plate is fixedly connected with a second mounting plate, the surface of the second mounting plate is provided with a set of mounting grooves, the upper ends of the mounting grooves are fixedly connected with a first fixing shaft, and the upper ends of the first fixing shaft are fixedly connected with a second fixing shaft; an air cylinder is arranged, the air cylinder drives a telescopic rod to stretch out and draw back and pushes a driving block to move, the driving block is matched with a connecting shaft and a fixing piece to enable a first bearing plate and a second bearing plate to protrude, the thigh of a patient is fixed to the first bearing plate through a leg binding belt, and the shank of the patient is fixed to the second bearing plate through the leg binding belt; and an air cylinder is matched with a telescopic rod to pus