The invention relates to an electric tool insulation detection device, and relates to power equipment. The electric tool insulation detection device comprises an outer shell, wherein the middle part of the outer shell is provided with a mounting groove, a lower box body and an upper box body are inserted in the mounting groove, the upper box body is rotatably connected with the lower box body, thelower box body is internally equipped with a winding mechanism, and the upper box body and the lower box body are internally provided with an auxiliary pressing mechanism. Two ends of conductive cloth are provided with joint portions. According to the invention, the multilayer winding of an electric tool can be realized by virtue of the winding mechanism of the conductive cloth, and the conductive cloth are additionally provided with the joint portions to prevent the conductive cloth from loosening. The conductive cloth is pressed and fixed during the resistance measurement process by virtueof the auxiliary pressing mechanism. The gap of the conductive cloth is extruded by using steel balls and negative pressure in the process, so that the conductive cloth is perfectly attached to the surface of the electric tool, and the problem of winding gaps of the existing detection equipment is solved.