The invention relates to a grinding device for grinding a liquid crystal panel. The grinding device comprises a grinding belt, a rotating mechanism, a supporting platform, a rotating driving motor and a detecting device, wherein the detecting device is provided with a sensing device and a self-generating device; the self-generating device is provided with a generating turbine; an edge of the generating turbine is in contact with the supporting platform and rotates around the axis of the generating turbine through the rotating mechanism so as to drive the generating turbine to rotate to generate power and supply electric energy to the sensing device to realize self-supply of power.