Roller wheel mixer is for mixing foundry sand and core sand used, the motor from the elastic and pin coupling He reducer input shaft coupling, after three slow, driven by the output shaft that is in the cross-head do counterclockwise rotation. Fastening the cross head of the crank, grinding wheel, internal and external sand-scraping plates with rotation along Phillips, stir together through the sand plate, grind wheels rolling, rubbing, thus completing the sand and core sand mixing process. Crosshead, crank, the arm castings are used to increase the mechanical life. Machine as a reasonable argument, advanced structure, which has a high efficiency, low energy consumption, compact structure, beautiful shape, runs smooth sand, etc., which do not leak.