The invention discloses a heat dissipation type relay with a breathing function. The relay comprises a fixing plate, a shell and a relay body, wherein the shell is slidably connected with an upper portion of the fixing plate in the vertical direction, one-way air outlet valves are fixed to upper ends of left and right side walls of the shell, the fixing plate is provided with a gas chamber along the length direction, a gas inlet hole I is formed in one end of the gas chamber, a drying layer is fixed on an inner side wall of the gas chamber, air inlet holes II are formed in an upper end of thegas chamber along the length direction at equal intervals, air inlets III in one-to-one correspondence with the air inlets II are formed in a bottom end of the shell in the length direction at equal intervals, and a one-way air inlet valve is connected between each second air inlet hole and the corresponding third air inlet hole. The relay is applied to the field of automobiles, an inner cavity ofthe one-way air inlet valve is opened through self deformation of the one-way air inlet valve, meanwhile, suction force is generated to rapidly suck air into the shell to dissipate heat of the relay,the one-way air outlet valve is matched to achieve the automatic breathing effect, and dry air flows in a one-way mode to achieve the heat dissipation function.