The invention relates to a collecting device, in particular to a rainproof cloth collecting device of a rare earth excavation construction site. The rainproof cloth keeping device of the rare earth excavation construction site has the advantages that rainproof cloth can be folded more orderly, manual collection is not needed, and waste at the bottom of the rainproof cloth can be directly cleared.According to the the technical scheme, the rainproof cloth collecting device of the rare earth excavation construction site comprises a frame, first wheels, second wheels, a first supporting frame, afirst sliding rod and the like; and the first wheels are rotationally arranged on the front side and the rear side of the left end of the frame, and the second wheels are rotationally arranged on thefront side and the rear side of the right end of the frame. According to the device, a supporting plate and a rocking handle are arranged, the supporting plate is used for placing the rainproof cloth,the rocking handle can be rotated leftwards and rightwards so as to drive the supporting plate to move leftwards and rightwards, and then the rainproof cloth can be placed more flatly and orderly; and a traction wheel is arranged, when the rainproof cloth is collected, the traction wheel can pull the rainproof cloth, upward movement of the rainproof cloth is facilitated, so that the rainproof cloth can be collected more easily, more quickly and more conveniently.