The invention discloses a preparation method of a suspending agent containing pyraclostrobin and copper abietate, belonging to the technical field of agricultural sterilizing agents. The preparation method comprises the steps of synthesizing copper abietate in a water phase in one step, adding a pyraclostrobin crude drug during the synthesis, and preparing the suspending agent containing pyraclostrobin and copper abietate by virtue of a sand milling process. Being different suspending agent compounding processes in the prior art, the preparation method has the advantages that copper abietate can be synthesized in one step, and the suspending agent containing pyraclostrobin and copper abietate can be produced. The mass percentage of pyraclostrobin to copper abietate contained in the suspending agent is (1 to 20)-(2 to 1), the mass percentage of effective components (namely pyraclostrobin and copper abietate) in the composition is 5%-40%, and the rest components are aid components and water required in the preparation process of the suspending agent. The compounded suspending agent is mainly used for preventing and treating multiple fungal and bacterial diseases of crops and simultaneously has an obvious stimulation effect to the growth of the crops.