Damp-proof drying device for underground building

The invention discloses a damp-proof drying device for an underground building. The device comprises a building body installed underground. Supporting columns arranged in a honeycomb shape are fixed at the bottom of the interior of the building body. The same sponge mat is placed at the tops of the supporting columns. A wood floor is laid at the top of the sponge mat. An air heater is mounted on the side edge of the building body. The air outlet of the air heater is communicated with a first hose. The first hose is inserted into an area below the sponge mat and is communicated with a main airpipe. The side edge of the main air pipe is communicated with a plurality of branch pipes arranged in parallel. Air holes are formed in the side edges of the branch pipes. An air extractor is installed on the inner wall of the building body. The air extractor comprises a first motor. The output shaft of the first motor is connected with a lead screw. A dry environment is provided for the lower portion of the wood floor. M