The utility model discloses a weighing device for a building concrete mixing plant. The concrete stirring device comprises a concrete stirring device body, an electronic scale, a stirring box and a weighing device, wherein a bearing base is arranged at the bottom of the concrete stirring device body; a first motor switch, a second motor switch and a first motor placing plate are arranged at the right end of the stirring box; a fifth sliding groove is formed in the connecting block; a sixth sliding groove is formed in the first fixing block. And supporting columns are welded to the left end andthe right end of the top of the bearing base correspondingly, a connecting rod is welded to the top ends of the supporting columns, the left end of the connecting rod is welded to the surface of thestirring box, and a connecting column is welded to the top end of the bearing base. The concrete mixer well overcomes the defects of concrete mixing in the prior art, and has strong practicability.