Cooling structure of engine

The invention provides a cooling structure of an engine, and belongs to the technical field of engines. The problem that an existing engine air cooling structure is not compact is solved. According to the cooling structure of the engine, the engine comprises a cylinder body and a cylinder head connected to the upper portion of the cylinder body, the cooling structure comprises a cooling water pump connected to the cylinder head, a combustion chamber and a cooling water jacket surrounding the combustion chamber are formed in the cylinder body, and a water outlet flow channel communicated with the cooling water jacket is formed in the cylinder head. The cooling structure further comprises a sewer channel arranged in the cylinder head, an inlet of the sewer channel is communicated with a water outlet of the cooling water pump, and an outlet of the sewer channel is communicated with the cooling water jacket. According to the cooling structure of the engine, the cooling effect is improved, and meanwhile the coolin