The invention relates to an algae compound flushing fertilizer, and belongs to the field of compound fertilizers. The algae compound flushing fertilizer is prepared by treating natural wild or artificially cultured algae and mixing the effective ingredients of the algae and urea, monoammonium phosphate, potassium sulfate, ammonium sulfate, chelated trace element, anti-caking agent and plant regulator 6-BA. The algae compound flushing fertilizer comprises the following components in percentage by weight: 2 to 10 percent of algae extract, 15 to 60 percent of urea, 5 to 12 percent of monoammonium phosphate, 15 to 50 percent of potassium sulfate, 1 to 10 percent of ammonium sulfate, 0.5 to 1 percent of chelated trace element, 0.1 to 0.2 percent of anti-caking agent and 0.1 to 0.3 percent of 6-BA. The fertilizer can be directly used with water, directly exerts fertilizer efficiency after being used, has high fertilizer efficiency, can be directly absorbed by crops after being used, is suitable to be used as a base fertilizer or early topdressing and can be scattered or flushed, and generally 10 to 20 kilograms of fertilizer is applied in each mu.