The utility model relates to a heat radiator for be used for equipment rack, the bottom of rack is provided with the bottom, and the mesh screen column structure is set to the bottom, and the below that lies in the bottom is provided with the heat exchanger that looses, and the heat exchanger that looses is connected with the air -out end of air supply mechanism, and mesh on scattered heat exchanger's the gas outlet sensing bottom lies in and is provided with the air outlet on the rack, air supply mechanism includes the forced draught blower, the air outlet of forced draught blower and air dryer's air intake intercommunication, air dryer's air outlet and air cleaner's air intake intercommunication, air cleaner's air outlet and scattered heat exchanger intercommunication, after the system is started, the forced draught blower is carried the cooling air in the external world to the air dryer in, air admission air cleaner after the drying, the cooling air of air cleaner output channels into from the heat exchanger that looses, and in the entering of the mesh on bottom rack, thereby play the interior equipment cooling of rack, reach rapid cooling's mesh, ensure systematic long -time steady operation, ensure to transfer the security.