The invention discloses a concrete spreader, mainly comprising a rack (1), a conical tower (2), a counterweight frame (3), a counterweight box (4), a hydraulic station (5), an electric cabinet (6), areducer (7), a big-arm support (8), a big arm (9), a small arm (10), a big-arm oil cylinder (11), a small-arm oil cylinder (12), a connecting rod pair (13), an antifriction bearing (14) and a spreading tube (15). The concrete spreader is characterized in that the conical tower (2) is movably fixed on the rack (1) by a bearing, the counterweight frame (3) is fixed on the conical tower (2), the counterweight box (4) is fixed at the lower part of the tail end of the counterweight frame (3), the hydraulic station (5) is fixed on the upper part of the tail end of the counterweight frame (3), the reducer (7) is arranged on the counterweight frame (3), the big-arm support (8) is fixed on the counterweight frame (3), one end of the big arm (9) is movably connected with the conical tower (2) and the other end thereof is connected with the small arm (10) by the antifriction bearing (14), a fixed support of the connecting rod pair (13) is arranged on the big arm (9) and the other fixed support thereof is arranged on the small arm (10), thereby achieving the design purpose.