The invention discloses an auxiliary device for paving a cable trench cover plate, which comprises a placing plate, supporting plates mounted on two sides of the placing plate, moving wheels mounted at the bottoms of the supporting plates, placing pieces mounted on the supporting plates, and a fixing frame mounted on the supporting plates, a moving part, a lifting part, a clamping part, a rotating air cylinder, a pulling part and a pushing part are arranged on the fixing frame, the lifting part is installed on the moving part, the clamping part is installed at the bottom of the lifting part, the rotating air cylinder is installed on one side of the lifting part, and the rotating air cylinder is matched with the clamping part. The arrangement of the moving wheels facilitates the driving of the device to move, the flexibility of the device is improved, and the arrangement of the placing piece and the placing plate facilitates the stacking of cable trench cover plates. The stacked cable trench cover plates are laid on the cable trench one by one under the action of the moving part, the lifting part, the clamping part, the rotating air cylinder, the pulling part and the pushing part, and the laying efficiency and laying quality of the cable trench cover plates are guaranteed.