The invention discloses a heat sink strength testing device, which includes a bottom frame, a limit block, a driving turntable, a first rotating shaft, a first coupling, a torque sensor, a second coupling, a second rotating shaft, a reducer, motor and sliding device; the lower end of the underframe is fixedly connected with a column, the top of the underframe is fixedly connected with a limit block, the end face of the limit block is provided with a first bar-shaped groove, and the driving turntable is provided with a first Two bar-shaped grooves, the first groove and the second groove are facing each other, the driving turntable is coaxially fixed with the first rotating shaft, and the first rotating shaft is connected with one end of the torque sensor through the first shaft coupling. shaft, the other end of the torque sensor is coaxially fixed with the second shaft through a second coupling, and a bearing is sleeved on the second coupling, and the output of the second shaft and the reducer The output end of the motor is connected to the input end of the reducer; the strength of the heat sink can be detected.