A novel superfine phosphorus-potassium fertilizer was developed to reduce the soil fixing and leaching of phosphorus-potassium fertilizer, improve the nutrition efficiency, reduce the fertilizer application rate, reduce non-point source pollution, and increase crop yield. The potted pakchoi experiment was conducted to study the effects of this new fertilizer on the yield and quality of pakchoi, soil nutrients and fertilizer use efficiency. Nine treatments were designed in this study, with common phosphorus-potassium fertilizer plus Humic Acid and common phosphorus-potassium fertilizer as the control. The phosphate-potassium fertilizer was grinded and mixed with Humic Acid, zeolite powder, diatomite activator respectively in different proportions, which were used to produce the superfine phosphorous-potassium activator fertilizer. The results were as follows:The superfine phosphorus-potassium activator fertilizer significantly increased the pakchoi yield by 13.22%~35.14%. The superfine phosphorus-potassium-Humic Acid-zeolite powder fertilizer, the superfine phosphorus-potassium-Humic Acid-diatomite fertilizer and superfine phosphorus-potassium-Humic Acid-zeolite powder -diatomite fertilizer reduced the nitrate contents in pakchoi by 30.46%~74.31%, and increased the soluble sugar contents by 41.70%~150.00%. The available phosphorus contents of soil increased 23.15% in average. For the superfine phosphorus-potassium activator fertilizer, the utilization rates of phosphate fertilizer were increased by 47.58%~238.62%. The agronomic utilization rates were increased by 114.14%~303.46%. The partial factor productivities of potassium fertilizer were increased by 13.22%~35.15%. The results indicated that the superfine phosphorus-potassium activator fertilizer could contact enough with the activating agent, which improve the fertilizer efficiency. Thus, it was recommended to select the superfine phosphorus-potassium-Humic Acid-zeolite-activated fertilizer in fertilizer production and application.