The invention discloses a heat-transfer cement pressing tool and a board heat radiation structure of a heat radiator. One board is provided with only one heat radiator. A pressed heat-transfer cement block is used for realizing gap filling of each electronic element and heat radiator on the board. The heat-transfer cement pressing tool comprises a frame on which a cement mold is horizontally placed. The upper surface of the cement tool is provided with a cement chamber for placing the cement and a heat radiator positioning structure for realizing positioning of the heat radiator. The frame is provided with a pressing block for pressing the heat radiator on a cement mold above the cement mold, and a pressing block lifting driving device which drives the pressing block to lift. The board heat radiation structure according to the invention can settle a problem of arranging the heat-transfer element because of different heights of the electronic elements. The corresponding heat-transfer cement pressing tool can satisfy a thickness requirement and a shape requirement of the cement, thereby ensuring high pressing quality of the heat-transfer cement.