The utility model provides a reciprocating type group of material device, it includes mobile base, the last mounting bracket that has linked firmly of mobile base, the upper portion of mounting bracket is articulated to be had pusher dog, lower part to link firmly to be used for keeping off the arm to the spacing level in pusher dog lower part, the pusher dog is the sketch plate, and the middle part of pusher dog is provided with the hinge hole along its thickness direction, and the weight that is located the pusher dog of articulated hole center line lower part is greater than the weight of the pusher dog on central line upper portion, and the bottom of pusher dog is less than the lower extreme that the arm was kept off to the level, there is spacing face A and the spacing face B who connects in order one side that the pusher dog is located level fender arm, and there is spigot surface A and the spigot surface B who connects in order the top of pusher dog. After adopting this kind of structural style, when mobile base was reciprocating motion along perpendicular paper direction, the collection of material was carried out in the rotation the limited range can be done to the pusher dog under the restriction of arm is kept off to the level in, its simple structure, and occupation space is little.