The invention provides an upper limb muscle strength tester. The upper limb muscle strength tester comprises a base, and two upper limb driving devices for arm driving are arranged on the base. Each upper limb driving device comprises a force application part, a rotating shaft connected with the force application part and a damping device arranged on the base, each damping device comprises a damper, and the dampers are in transmission connection with the rotating shafts and output damping torque. The upper limb muscle strength tester further comprises torque sensors arranged on the rotating shafts, speed measuring devices arranged on the dampers and used for detecting the rotating speed of the axes of the dampers, and a CPU. The CPU is electrically connected with the damping devices and controls the damping torque output by the dampers, the CPU is electrically connected with the torque sensors and acquires torque acting on the rotating shafts, the CPU is electrically connected with the speed measuring devices and acquires the rotating speed of the axes of the dampers, and the CPU processes the torque acting on the rotating shafts and the rotating speed of the axes of the dampers so as to obtain acting force acting on the rotating shafts and the rotating speed of the rotating shafts under different damping torque values, so that the upper limb muscle strength of a testee is objectively judged.