The utility model discloses a roller type engine. The roller type engine comprises an air distribution compression part and a roller work doing part. The roller type engine is characterized in that the air distribution compression part mainly comprises a screw compressor, a screw compressor outside housing, an air inlet channel, a throttle valve and an oil nozzle, the head portion of the screw compressor is connected with the air inlet channel, the air inlet channel is provided with the throttle valve and the oil nozzle, a main shaft is installed on the inner side of the screw compressor in a sleeved mode, and the air inlet head end of the air inlet channel is provided with an air filter; a partition plate is installed at the lower end of the air distribution compression part, a cushion plate is installed at the lower end of the partition plate, the roller work doing part is installed at the lower end of the cushion plate, the partition plate, the cushion plate, the roller work doing part and a big flywheel are all installed on the main shaft, the big flywheel is located below the roller work doing part, and the big flywheel is connected with a starter gear through teeth. The roller type engine is simple in structure, high in power, low in cost and requirement for fuel and broad in application prospect, pioneers development of third-generation engines and brings a revolution for modern engines.