The invention discloses a damping base of an electric power instrument, which comprises a shell, a spring is arranged on the bottom surface in the shell; the tail end of the spring is connected with apower meter; first through holes are formed in the left side wall and the right side wall of the shell. A nut is mounted in the through hole I; screw rod in threaded connection with nut, a handle isfixedly connected to the end, located on the outer side of the shell, of the screw. The screw rod can rotate on the nut through the handle; a clamping block is fixedly connected to the end, located inthe shell, of the screw rod, the clamping blocks are located on the two sides of the electric power instrument, the electric power instrument is placed on a spring in the shell, a handle is rotated to enable the screw rod to rotate on a nut, the clamping blocks are moved towards the middle, the electric power instrument is clamped and fixed, and the electric power instrument cannot swing left andright; by arranging the spring, shaking of the electric instrument can be reduced, and the sensitivity of the electric instrument is prevented from being affected by vibration; by arranging the screwrod and the rotatable handle, the screw rod rotates on the nut, the clamping block moves towards the middle, and the electric power instrument is clamped and fixed.