The invention discloses an internal combustion engine, in particular a rotary type internal combustion engine. The rotary type internal combustion engine is characterized in that a combustion chamber,the shell surface of which is provided with an opening, is installed on an engine inner body; a seal ring is arranged on the shell of the engine inner body around the opening of the combustion chamber, and the bottom of the seal ring is provided with a groove for mounting a shrapnel; an exhaust hole and an air nozzle and an oil nozzle are arranged on an engine outer body at the position oppositeto the center line of the opening of the combustion chamber, wherein the air nozzle and the oil nozzle are arranged in a line. The invention has simple structure, stable mechanical performance, less friction consumption, high efficiency, rotating speed and oil saving efficiency and long working application time.