Protective device of angle grinder

The utility model discloses a protective device of an angle grinder, which is provided with a rear protective cover, a front protective cover and a handle protective cover, and the rear protective cover and the front protective cover can realize full protection on the periphery of a grinding wheel, so that sparks and scraps generated by grinding can be effectively prevented from flying to operators and surrounding personnel; according to the auxiliary handle, the handle protection cover can protect the hand face, holding the auxiliary handle, of a person safely, and the situation that the hand face of the person is burnt due to the fact that grinding sparks splash to the hand face of the person is avoided; the machine body heat insulation shell comprises an outer shell and an inner shell, and an air heat insulation layer is arranged between the inner shell and the outer shell; the air heat insulation layer can prevent heat of the inner shell from being transmitted to the outer shell to a certain degree, the i