Provided is a disc-type jet turbine engine with controllable and rotational discharge ports at two sides of a discharge chamber, a fuel tank, and an operation lever connected with the discharge ports. The rotor shaft of the jet turbine engine is connected with a start-up electrical motor through a clutch and with a fuel pump through a gearbox. The fuel nozzle of the engine is connected with the fuel tank via the accelerator control valve and the fuel pump. The operation lever controls the clutch. The handle of the operation lever is provided with an electrical switch, a direction controller and an accelerator controller. The switch is electrically connected with the start-up electrical motor, the accelerator controller is connected to control the accelerator control valve, and the direction controller is connected with the discharge ports. Around the combustion chamber is an air-flow guide chamber having an air cooling and heat-insulate layer.