The invention discloses a highly-efficient heat radiator with a cleaning function used for a computer. The highly-efficient heat radiator comprises a support and a heat radiation block. The bottom ofthe support is equipped with the heat radiation block. One side of the heat radiation block is provided with an exhaust fan. The interior of the support is provided with a fan. The surface of the support is equipped with fixing screws. The surface of the heat radiation block is provided with a heat radiation fin assembly. The top of the support is provided with a protection cover. One side of theprotection cover is equipped with a soft hairbrush assembly. The surface of the protection cover is equipped with pre-saved mounting holes. One side of the exhaust fan is equipped with a filter box. The highly-efficient heat radiator with the cleaning function used for the computer is reasonable and novel in design, convenient in installation and detachment and has good heat radiation effect. Additionally, dust of the surface of the heat radiator can be cleaned while heat of the computer is radiated. Meanwhile, dust is easily cleaned in the later period. Heat radiation efficiency of the heat radiator can be effectively increased. The computer can be reasonably protected. The highly-efficient heat radiator enjoys higher practicability and is suitable for extensive promotion and application.