The movable blade rotor engine has several concave cavities serving as the intake, compressing, work doing and exhaust chambers separately, as well as combustion chambers and intake ducts and exhaustducts in the raised casing parts, so that each of the movable blades can do work once passing through two concave cavities. For example, in case of four concave cavities, four movable blades, two combustion chambers and two intake and exhaust ducts, once rotation of the rotor and the four blades through four concave cavities do work for eight times. Compared with available engine, the present invention has greatly raised efficiency. In the same time, the present invention has combined lubricating system and cooling system, less subsystem loops and simplified structure. It has also heat dissipating teeth outside the casing to strengthen the heat dissipating effect.