Portable medical rehabilitation instrument

The portable medical rehabilitation instrument comprises a training box and a seat plate, a training cavity is formed in the training box, the bottom of the training box is fixedly connected with two supporting columns which are far away from each other, the two supporting columns are each of a hollow structure, the sides, close to each other, of the two supporting columns are each provided with a sliding opening, and the sliding openings are communicated with the training cavity. A stretching assembly is arranged in the training cavity, the two sides of the seat plate abut against the outer walls of the sides, close to each other, of the two supporting columns respectively, and a telescopic column is fixedly connected to the bottom of the seat plate; the novel training bed is simple in structure and convenient to use, a patient can be adjusted to a comfortable position for training through the seat plate, it can be guaranteed that the seat plate cannot move during training through the second rack and the thi