The invention provides a power distribution cabinet for physical heat dissipation. The power distribution cabinet comprises a distribution box, a fixed sealing plate, cables, cement blocks, through holes, a connecting rod, an air flow gyrotron, a through pipe, a door plate, an inner door plate, a switch, a reinforcing plate, a distribution box back plate, connection holes, an air inlet rod, an airoutlet pipe and a fixing block, wherein the door plate is movably connected to one side of the distribution box through a hinge; the inner door plate is located at a front end inside the distributionbox; the switch is fixedly connected to one side of the inner door plate; a reinforcing plate is fixedly arranged at a top end of the distribution box; the fixed sealing plate is located inside the distribution box; the cables are uniformly distributed on the inner side of the fixed sealing plate; the cement blocks are uniformly distributed at the front end of the fixed sealing plate; and one side of each cable is fixedly connected with the cement blocks. Through adoption of the power distribution cabinet for physical heat dissipation, moist air such as external water gas can be prevented from flowing into the distribution box by means of the structural design. The power distribution cabinet has reliable moisture-proof effect and mold-proof functions.