Engine exhaust pipe sealing structure

The engine exhaust pipe sealing structure comprises a cylinder cover with a cylinder cover exhaust passage, an exhaust pipe and a water cooling housing, the cylinder cover exhaust passage is provided with an insertion section and a ventilation section, the inner diameter of the insertion section is larger than that of the ventilation section, and at least part of the exhaust pipe extends into the insertion section to be matched with the cylinder cover exhaust passage in an insertion manner; an air storage cavity is defined by the water-cooling housing, part of the exhaust pipe is located in the air storage cavity, the water-cooling housing is provided with an opening allowing the exhaust pipe to stretch out, an airflow channel communicated with the air storage cavity is formed between the inner circumference of the opening and the outer wall of the exhaust pipe, the water-cooling housing abuts against the end face of the cylinder cover, and a first sealing ring is arranged at the abutting position. The sealin