NOVELTY - Biological repairing petroleum polluted sand beach comprises using immobilized 2 mm particle diameter and high efficiency petroleum hydrocarbon degrading microbial inoculum as granular agent, adding commercial agricultural fertilizer as slow release solid nutrient, adding nitrogen and phosphorus to C:N:P amount of 100:10:1, where C is petroleum hydrocarbon of sand beach, or using sodium nitrate and monopotassium phosphate, granulating, and slow release treating to obtain solid nutrient agent.    USE - Method for biological repairing petroleum polluted sand beach (claimed).    ADVANTAGE - The method is environment-friendly and simple, and has reliability theory, high repair rate, low cost.    DETAILED DESCRIPTION - Biological repairing petroleum polluted sand beach comprises:    (A) using immobilized 2 mm particle diameter and high efficiency petroleum hydrocarbon degrading microbial inoculum as granular agent, adding commercial agricultural fertilizer as slow release solid nutrient, adding nitrogen and phosphorus to C:N:P amount of 100:10:1, where C is petroleum hydrocarbon of sand beach, or using sodium nitrate and monopotassium phosphate, granulating, and slow release treating to obtain solid nutrient agent;    (B) determining pollution by depth and area, determining single biological repairing device area, taking solid nutrient agent and granular agent, covering into heave position of upper layer screen at biological repairing device, covering lower layer screen, entering porous upper layer PVC support board and porous lower layer PVC support board middle, installing plastic frame, and fixing; and    (C) determining the needed biological repairing device amount, vertically digging at height of 1.1-1.5 times the device height, embedding biological repairing device into intertidal zone, determining for 15 days, separating for 3 days, measuring number total of petroleum hydrocarbon and petroleum hydrocarbon degrading fungus, adjusting, and taking biological repairing device.