The invention discloses a bloom alga blocking, enrichment collection and alga removal system. The system comprises at least one alga collection unit, a blue alga conveying main pipe, a boost pump anda control platform. Each alga collection unit is composed of an enclosure device and an alga collection device. Each enclosure device is fixed in water in a V shape and comprises a first floating body, a skirt body and a balance weight, wherein the balance weight is sunken to water bottom mud, the first floating body floats on the water surface, and the skirt body is connected between the first floating body and the balance weight. The open face of the V shape of each enclosure device faces an open water area. Each alga collection device is arranged in the included angle of the V shape formedby the corresponding enclosure device and comprises an alga suction head, a second floating body, an alga suction pump and a collection pipeline, wherein the alga suction pump is connected with the alga suction head and controls the alga suction head to extract algae, and the second floating body is connected to the alga suction head. Each second floating body is connected with the corresponding first floating body through a mooring rope. The collection pipelines collect the algae extracted by the alga suction heads, and the algae are conveyed to the blue alga conveying main pipe. By means ofthe system, the removal efficiency of algae of the lakeside blue alga enriched area can be remarkably improved, the process is simple, and the operation and maintenance cost is low.