Filter used for compressed natural gas dispensers

The utility model discloses a filter used for compressed natural gas dispensers, which comprises an upper barrel, a lower barrel, an air inlet passage, a purified gas outlet passage and a sewage draining hole, wherein the upper barrel is connected with the lower barrel so as to form a purification cavity; the air inlet passage is arranged on the side surface of the upper barrel; the sewage draining hole is arranged at the bottom of the lower barrel; the air inlet passage and the sewage draining hole are both communicated with the purification cavity; the purified gas outlet passage is arranged at the top of the upper barrel; a filtering device is arranged in the purification cavity; and the filtering device comprises a filter core, a filter core support and a support seal head. The air inlet passage, the purified gas outlet passage and the sewage draining hole are improved in opening design, therefore, the filter not only has good filter capacity of tiny impurities, but also is more stably and reliably matched with a control system, and simultaneously has convenient disassembly and easy examine and repair.