Abrasive particle flow ultra-precision machining device

The invention provides an abrasive particle flow ultra-precision machining device. Injection pressure and speed of abrasive particle flows are adjusted by adjusting threads between a pressure head and an abrasive particle flow injection polishing nozzle, and pressure is provided for a sealed box through a pneumatic cylinder, so that pressure is applied to the pressure head through a pressure plug. According to the abrasive particle flow ultra-precision machining device, the pneumatic cylinder for replacing a spring applies pressure to the pressure head so that accuracy of pressure of the abrasive particle flow injection polishing nozzle to a work-piece can be effectively improved, the abrasive particle flow machining accuracy is improved, and ultra-precision machining is achieved; meanwhile, concentration of abrasive particles in the abrasive particle flows is monitored and controlled in real time, so that machining accuracy and efficiency are guaranteed; Injection pressure and speed of the abrasive particle flows are adjusted by adjusting the threads between the pressure head and the abrasive particle flow injection polishing nozzle, and a pressure-maintaining flow stopping part is arranged at the tail end of the abrasive particle flow injection polishing nozzle so that the machining efficiency can be effectively improved. By means of the abrasive particle flow ultra-precision machining device, both machining efficiency and ultra-precision machining accuracy can be guaranteed.