Dehumidification air conditioning unit for underground engineering

The invention relates to a dehumidification air conditioning unit for underground engineering. The dehumidification air conditioning unit comprises a support and a shell arranged on the support, a main filter is arranged in the shell, a rotating shaft is rotationally arranged in the shell, a dovetail groove is formed in the end wall of the main filter, a dovetail block is fixedly arranged on the surface of the rotating shaft, an operation hole is formed in the top of the shell, a rotating assembly is arranged on the shell, and sealing plates are symmetrically and fixedly arranged on the side wall of the rotating shaft; a discharging hole is formed in the outer side wall of the shell, and a discharging assembly is arranged on the shell; a feeding box is arranged on the shell, a plurality of negative filters are placed in the feeding box, feeding holes allowing the negative filters to penetrate through are formed in the outer side wall of the feeding box, and an abutting elastic piece is fixedly arranged in the