The utility model discloses a rubbing crusher that old and useless rubber recycling production used, its characterized in that, including motor, drive assembly and screw assembly, the utility model discloses a rubbing crusher changes drive machine pulley drive's mode, through the mode that adopts gear engagement for the transmission of motor is more steady, thereby can drive the rotation of screw rod smoothly, and then has guaranteed the quality of screw rod to rubber, is what gear engagement adopted simultaneously " pinion the gear wheel, the pinion the gear wheel " the mode, can be so that whole drive assembly compactness more. In addition and since footstep bearing not the direct mount but install to sheathe in the transition and contact with screw assembly's shell inner wall in drive assembly's quick -witted incasement wall department, the axial force does not transmit the quick -witted case for drive assembly, therefore quick -witted case tank wall can the attenuate, the meshing condition of gear is good.