The invention provides a tool for flattening concrete and paving films. A shell body of a damping device is arranged on the left side or the right side of a trailing plate, first elastic components and second elastic components are both arranged in the shell body in the front-back direction and are arranged at intervals in the front-back direction, the front ends of the first elastic components are connected with the front end of the shell body, the rear ends of the second elastic components are connected with the rear end of the shell body, connection rods are arranged in the front-back direction, the front ends of the connection rods are movably arranged between the rear ends of the first elastic components and the front ends of the second elastic components in the front-back direction and are limited by the first elastic components and the second elastic components in the front-back direction, the middles of the connection rods are penetratingly arranged at the rear end of the shellbody, a film covering pull rod penetrates through a hollow tube of a film reel in the left-right direction, and the rear ends of the connection rods are connected with the film covering pull rod. Thetool disclosed by the invention can achieve integrated operation of flattening floor concrete and paving the films, so that construction procedures are simplified, and the work efficiency is improved; furthermore, forming quality is improved; the tool has the advantages of ingenious design, concise structure, convenience in manufacturing and low cost.