Small secondary precise sterilization filter

The utility model discloses a small secondary precision degerming filter, which comprises a primary filter and a secondary filter, a discharge port at the bottom of the primary filter is fixedly connected with a feed port at the top of the secondary filter, and the primary filter comprises a filter tank, a filter membrane or filter paper and a filter bottom. A first heat preservation jacket is arranged on the inner wall or the outer wall of the filter tank, the filter tank is connected with the filter bottom through a flange, a filter membrane baffle is arranged on the upper portion of the filter bottom, and a filter membrane or filter paper is located on the filter membrane baffle. The secondary filter comprises an outer barrel, a filter element, a fixed seat and a connecting hoop, the outer barrel is arranged outside the filter element in a sleeving manner, a second heat preservation jacket is arranged on the inner wall or the outer wall of the outer barrel, a connecting ring is fixedly arranged at the lowe