The invention relates to an automatic dust removing sealing filter which comprises a shell, a preliminary filter element, a main filter element, a safety filter element, a vibrator, a pressure releasing cavity and the like. A coarse filter is arranged on the side wall of the shell. An air inlet is formed in the coarse filter. The preliminary filter element is installed on the inner side of the shell. The vibrator is arranged between the outer side of the preliminary filter element and the side wall of the shell. A flow guide cavity is formed in the bottom of the inner side of the preliminary filter element. The preliminary filter element and the flow guide cavity are installed in the outer circle of a bottom cover. An auxiliary bottom cover is arranged on the inner circle of the bottom cover. A gas guide cavity is formed between the bottom cover and the auxiliary bottom cover. A gas guide hole is formed in the outer side of the gas guide cavity. The pressure releasing cavity is formed in the top of the outer side of the auxiliary bottom cover. A flow resisting cavity is formed in the inner side of the pressure releasing cavity. The main filter element is sleeved with the flow resisting cavity. The main filter element is installed on the top of the auxiliary bottom cover. The safety filter element is arranged in the main filter element. A gas injection opening is formed in the bottom cover and connected with an electromagnetic valve. The automatic dust removing sealing filter has the beneficial effects that the structure is simple, sealing is reliable, the size is small, the filtering precision is high, the phenomenon that an engine is abraded early is effectively prevented, the service life of the filter is prolonged, and energy consumption in work and production is reduced.