Multipurpose grinding machine

The invention relates to the field of grinding equipment, and particularly discloses a multipurpose grinding machine, which comprises a seat plate, a driving roller, a driven roller, a clamping block, a supporting plate assembly with a supporting plate, a power box, a sliding frame, a push rod with an inclined end face, a driving device and a push rod seat with an inclined bottom face. According to the grinding machine, the driving roller and the driven roller which are arranged in the triangular shape are arranged in the grinding machine to drive a grinding belt to conduct grinding, a receding opening is formed in the working area of the grinding belt, and the grinding machine can be suitable for grinding planar workpieces and can also be suitable for grinding curved-surface workpieces; the grinding belt can be supported through the telescopic supporting plate assembly when a plane is ground, so that the grinding effect is improved, the two grinding modes of powerful grinding and common grinding on the workp