NOVELTY - Improving biochemical property of papermaking wastewater by coagulation-irradiation combined technology, comprises: (i) adding aluminum polychloride into papermaking wastewater and coagulating to remove the organic matters from the papermaking wastewater; (ii) ionizing the coagulated papermaking wastewater, where the irradiation source adopts Co60 irradiation appliance or Dynamitron (RTM: Electron beam particle) type electron accelerator with 0.5MeV, 40mA, and adding papermaking wastewater into irradiation resistant tube, and placing in the irradiation field for radiating.    USE - The method is useful for improving biochemical property of papermaking wastewater.    ADVANTAGE - The coagulation-irradiation combined technology not only removes the organic matters which are difficult to biodegrade, but also lowers the irradiation dose to a large extent to improve the economical efficiency for papermaking wastewater.    DETAILED DESCRIPTION - Improving biochemical property of papermaking wastewater by coagulation-irradiation combined technology, comprises: (i) adding aluminum polychloride (300 mg) into papermaking wastewater (1 liter) and coagulating to remove the organic matters with molecular weight of more then 300 kDa from the papermaking wastewater; (ii) ionizing the coagulated papermaking wastewater, where the irradiation source adopts Co60 irradiation appliance or Dynamitron (RTM: Electron beam particle) type electron accelerator with 0.5MeV, 40mA, when adopting the Co60 irradiation appliance, the radioactivity is 481TBq, and adding 20 ml of papermaking wastewater into 50 ml irradiation resistant tube, and placing in the irradiation field for radiating, where the irradiation time is 53-266 minutes and using the ferrous sulfate dosimeter to measure the ~g ray dose rate as 9.4 Gy/minutes, and when adopting Dynamitron (RTM: Electron beam particle) type electron accelerator with 0.5MeV, 40mA, the dose rate of the electron beam is 21.2 kGy/minute, and adding 20 ml of papermaking wastewater into 50 ml irradiation resistant tube, and placing in the irradiation field for radiating, where the irradiation time is 1.41-7 seconds.