Automatic grinding machine for embedded pipes

The invention relates to an automatic grinding machine for embedded pipes. The automatic grinding machine comprises a frame body, a platform plate which is arranged on the frame body and a guide railwhich is fixedly arranged above the platform plate, the platform plate is successively provided with a feeding device, a conveying device, a grinding device and a sweeping device along the guide rail,the guide rail is formed between two guide plates which are arranged in parallel with each other, two ends of the guide rail are provided with a blanking port and a demising groove; the feeding device is arranged at the left end of the guide rail, the feeding device comprises a feeding bin which can place a plurality of the embedded pipes and a distributing device which is used for sliding the embedded pipes from the feeding bin to the guide rail one by one; the conveying device is arranged at one side of the guide rail, the conveying device comprises a pipe shifting bracket and a driving mechanism which drive the pip