The invention discloses an injection nozzle extruding and grinding system. The injection nozzle extruding and grinding system comprises a grinding box, an ECU (electronic control unit), an injection nozzle and a pressurized delivery device, wherein the pressurized delivery device is arranged between the grinding box and the injection nozzle. A grinding material impurity filter for filtering out metal filings and impurities with particle sizes exceeding 0.05mm in grinding fluid is arranged between the grinding box and the pressurized delivery device, and a multistage grinding material sizer capable of subjecting grinding materials in the grinding fluid to classified particle size selection is arranged between the pressurized delivery device and the injection nozzle. The injection nozzle extruding and grinding system has the advantages that by the structure, the grinding material impurity filter is capable of filtering the metal filings and other large-particle impurities with the particle sizes exceeding 0.05mm in the grinding fluid; the multistage grinding material sizer is capable of subjecting the grinding materials in the grinding fluid to classified particle size selection to enable small orifices to adopt grinding particles with small particle sizes, so that blockage of the orifices is prevented; additionally, the multistage grinding material sizer is capable of achieving staged grinding of the same injection nozzle orifices, and accordingly, both grinding processing precision and processing efficiency of the orifices are improved.