The invention discloses a sealing structure of an engine exhausting pipe. The sealing structure comprises a first section of exhausting pipe, a second section of exhausting pipe and a sealing ring; one end of the first section of exhausting pipe is a sealing inserting end and is provided with a peripheral clamp groove; the sealing inserting end of the first section of exhausting pipe is inserted to the second section of exhausting pipe to form the sealing structure; the sealing ring is made of a high temperature resistant fiber material, and is arranged in the peripheral clamp groove to improve a connecting sealing effect between the first section of exhausting pipe and the second section of exhausting pipe. The sealing structure of the engine exhausting pipe adopts the sealing ring made of the high temperature resistant fiber material, during assembly, the sealing ring is placed in the exhausting pipe clamp groove and then connected with the other section of exhausting pipe so as to achieve a sealing action between the two sections of exhausting pipes, the sealing effect under a high temperature condition is good without oil leakage and gas leakage, the process is simple in operation and low in comprehensive cost, and problems of oil leakage and gas leakage of various sections of the engine exhausting pipe are solved.