A dynamic pressure plasma synthesis jet generator relates to a jet generating device. The device uses the dynamic pressure of the forward incoming flow to introduce a high-speed incoming flow into a plasma generator cavity through an air bleed pipeline and a one-way valve, the pressure inside the cavity is increased, and meanwhile, a high-temperature plasma is generated in the cavity through high-voltage discharge, so that the air in the cavity is subjected to thermal expansion, and a high-speed jet is generated at a jet outlet. The device is provided with a plasma generator, the air bleed pipeline, the one-way valve and a high-voltage pulse power supply, wherein the plasma generator is composed of a negative electrode, a positive electrode and a generator cavity, and the generator cavityis provided with an incoming flow inlet, the jet outlet and electrode insertion holes. The device has the advantages of simple structure, light weight, low cost, almost no influence on the aerodynamicshape of an aircraft while generating the high-speed jet, and the like. In addition, the device can also control the jet velocity within a certain range by changing the loaded electrical parameters.