The utility model discloses an anti-clogging device for a breathing tank air inlet. The anti-clogging device comprises a filtering drying tank which is composed of an upper end cover, a lower end cover and a shell. A drying agent layer is arranged in an inner cavity of the shell. An air inlet and an air outlet of the lower end cover are respectively provided with a sintering metal mesh. The upper end cover is provided with an air inlet pipe and an air outlet pipe. The sintering metal mesh is provided with a heater. The heater is connected with a controller and a power source. The drying agent layer is a silica gel layer or a calcium chloride layer. The heater is arranged on the sintering metal mesh. When the external temperature is too low, the sintering metal mesh is frozen and blocked, and then the controller starts the heater instantly, and therefore the sintering metal mesh is kept in an unblocked state and the safety of the sintering metal mesh is good.