The invention relates to a porcelain bottle insulator with a safety cover and a grounding ring. The top end of the metal end of the porcelain bottle insulator is provided with a wiring clamp; the wiring clamp is connected with the grounding ring through a connecting arm; the joint of the metal end of the upper end of the porcelain bottle insulator and the wiring clamp and the joint of the wiring clamp and the grounding ring are both installed in the safety cover; the grounding ring extends out from the side surface of the safety cover through the connecting arm; and the safety cover is composed of an half box body, an upper box body and a low box body. According to the porcelain bottle insulator of the invention, the top end of the insulator is provided with the wiring clamp, so that the problems of troublesome construction and instable power line fixation can be solved; the upper box body and the half box body of the safety cover are connected with each other through a connection body at the top end of the insulator, the safety cover can be bent and folded and unfolded arbitrarily, and the half box body, the upper box body and the low box body are connected with one another in a locking manner through lock catches, and therefore, the porcelain bottle insulator is simple in structure and convenient to produce and install; and the insulator and the grounding ring are integrated, so that swing caused by the suspended installation of the grounding ring can be avoided, and great conveniences can be brought to operation.