Abstract:The pulsed feeding device of the magnetic field assisted micro abrasive water jet is designed by help of combining pneumatic conveying method and assisted external magnetic field, with an aim to realize the stability and controllability for the micro abrasive water jet polishing. The feeding device was mainly consisted of stock bin, air source, pressure regulators, stop valves, transmitters, electromagnetic controller, gas feed pipe and material feed pipe, and etc.. The pressure regulating valve was connected with the gas supply device to regulate the gas pressure. The working gas was flowed from the bottom up into the hopper inside the stock bin through the pipeline, the abrasive inside the stock bin was changed to the mist, the fluidity of the abrasive was improved, and then it was flowed out of stock bin via line. When it flowed through the throttle, the quantity of the abrasive was controlled with transmitters by the pulse operation frequency and the opening degree of the throttle, and then the intermittent abrasive feeding method was achieved. When the abrasive flow flowed into the nozzle, the speed and movement direction of the abrasive are further adjusted by the effect of magnetic fields near the nozzle, and the speed and direction optimization of micro abrasive is achieved, thus the mixed quality of the abrasive water jet is improved.