A strength training control device comprises: a torque source (including a base frame, a motor and a gear reduction box); a drive arm, an operating rod, and a link mechanism. A beam-type load cell is coupled to the operating rod, the link mechanism, and the drive arm for measuring the load value. An electronic meter is provided for setting a torque value, and a servo controller for comparing a load value of beam-type load cell with a set value of the electronic meter. After the difference value is adjusted, an electric current is outputted to drive the motor, and the motor torque is amplified by the gear reduction box and transmitted through the link mechanism to the operating rod, and users can obtain a torque value equal to the setting of the electronic meter.