Filling method for filter material

The invention discloses a filling method for a filter material. The method is characterized by comprising the following steps: step a, vertically placing a drum body; step b, selecting a filling device with a suitable size, wherein the body of the filling device is of a funnel-shaped structure, the bottom surface of the body is provided with an annular groove, the central part of the interior of the body is provided with a protective column which is connected with the inner wall of the body via a radial strip, and the bottom surface of the protective column is provided with a protective groove; step c, fixing the annular groove of the filling device outside the thread connection part at the upper end of the drum body and sleeving the upper end of a central tube with the protective groove of the protective column; step d, pouring the filter material into the body, wherein the filter material flows to the drum body from the opening at the lower part of the body; and step e, removing the filling device after filling is finished. According to the invention, the annular groove can block the thread connection part at the upper end of the drum body, and the protective groove of the protective column can block the upper end of the central tube; thus, the filter material is effectively prevented from contacting with the two parts, thereby preventing the filter material from polluting the drum body.