The invention belongs to the technical field of medical apparatuses, and in particular relates to a rehabilitation training device applied after a breast cancer operation. The rehabilitation trainingdevice comprises a square shell, a lifting component, a rocker component, a lifting platform and a wall climbing ruler, wherein a shelf plate is arranged in the middle of the shell; the wall climbingruler is arranged at the right side of the shell; the lifting platform is arranged at the bottom of the front side of the shell; the rocker component is arranged at the left side of the shell; the lifting component comprises an inner water tank, an outer water tank, a pulley A, a pulley B, a pulley C, a pull rope and a lifting rod; the inner water tank is arranged at the top of the shelf plate, and the lifting rod is connected to the front side of the inner water tank; the pulley A is arranged in the center of the top of the shell; the pulley B is arranged at the top of the front side of the shell; the pulley C is arranged at the lower end of the front side of the shell; one end of the pull rope is fixedly connected to the top of the inner water tank and the other end sequentially spans over the top of the pulley A, the top of the pulley B and the rear side of the pulley C; and the outer water tank is arranged at the back side of the shell. The rehabilitation training device provided by the invention, after a patient is discharged from a hospital, can assist the patient in completing affected-side upper limb function training after the operation, and the patient can independently adjust the weight of loads without barrier; therefore, the rehabilitation training device is convenient and effective.