The utility model discloses a high-temperature gas filter. The high-temperature gas filter comprises a shell and a flower plate, wherein the internal space of the shell is divided into a clean gas cavity and a dusty gas cavity by the flower plate, the flower plate is fixedly connected with a filter unit by a small tube sheet and a pressure plate, a deashing unit is arranged above the filter unit, a gas inlet unit is arranged under the filter unit, a bottom plate and a reinforcing rib plate are fixedly connected on the deashing unit, a bottom plate, the small tube sheet and the flower plate are fixedly connected by fastening elements, the filter unit comprises multiple metal filter elements and multiple security filter elements, a flange is arranged at the top of the metal filter element, a hollow spring seat is arranged at the top of the flange, a spring sleeves the hollow spring seat, an internal thread short pipe is connected on the pressure plate, an external thread short pipe is connected at the bottom of the security filter element, and the external thread short pipe is in threaded connection with the internal thread short pipe. The filter unit cannot be fractured easily, the dashing unit has good back flushing effect, the gas filter can be operated stably and safely for a long time, and the gas filtering efficiency is high.