NOVELTY - Improving printing and dyeing wastewater biochemical treatment ability using soybean powder having enzyme activity, involves (a) making the printing and dyeing sewage by normal secondary treatment enter into a biochemical system, (b) further providing the biochemical treatment system with two reserved portions connected with the enzyme agent tank, (c) ultrasonic microwave-dissolving the pre-dissolved enzyme active soybean powder after pre-dissolving, and (d) processing the water sample, completely aerating, and then entering to the next process step.    USE - The method is useful for improving printing and dyeing wastewater biochemical treatment ability using soybean powder having enzyme activity.    ADVANTAGE - The method has simple technique operation, requires no great change in the current biochemical system, is capable of improving biochemical efficiency, and reduces the enzyme extraction and application cost. The agent addition is more convenient, and the method is provided with good application prospect.    DETAILED DESCRIPTION - Method for improving printing and dyeing wastewater biochemical treatment ability using soybean powder having enzyme activity, involves (a) making the printing and dyeing sewage by normal secondary treatment enter into a biochemical system, (b) further providing the biochemical treatment system with two reserved portions, where the two reserved portions are connected with the enzyme agent tank, in which one reserved portion is used as the outlet of the biochemical treatment system to intercept the portion of water sample by the secondary treatment to the enzyme agent tank, used as pre-dissolving the enzyme active soybean powder, and the other reserved portion is as sewage sample of the enzyme active soybean powder in enzyme agent tank and returns back to the inlet of the biochemical treatment system, (c) at intervals ultrasonic microwave-dissolving the pre-dissolved enzyme active soybean powder after pre-dissolving for 1 hour, and (d) processing the water sample, completely aerating in the aerobic aeration pool, after a certain residence time, and entering to the next process step.