The invention relates to an electric spark deposition contact force controlling device with a damping function. The electric spark deposition contact force controlling device with the damping functionmainly comprises an air cylinder, a sliding table, a base, a weight, a clamping mechanism, an angle adjusting device, a throttle valve, a pressure gauge, an inflating valve and the like, wherein themoving direction of a piston of the air cylinder is consistent with the moving direction of the sliding table, and the sliding table moves when the piston moves, so that an electrode is driven to moveup and down, and when the electrode moves downwards, the electrode makes contact with a workpiece. The gravity of a sliding part is counteracted by using thrust generated by the air cylinder in an airtight pneumatic system, the sliding part is pushed by the gravity of the weight to move downwards to form contact force between the electrode and the workpiece, the throttle valve in the airtight pneumatic system generates damping on movement of the piston, electrode vibration caused by recoil force generated in a moving process of the electrode and the workpiece is restrained, in an electric spark deposition surfacing process, stable contact between the electrode and the workpiece and constant contact force can be ensured along with electrode loss and movement of the sliding table, work is reliable, and adjustment is convenient.