Filtering device of printing machine water tank

The utility model relates to a printing machine water tank filtering device which comprises a rack, a waste water pool is arranged on the rack, the waste water pool is connected with the rack, the printing machine water tank filtering device further comprises a filtering piece, a first clamping block, a second clamping block and a rotating mechanism, and the filtering piece is located in the waste water pool and makes contact with the side wall of the waste water pool; the first clamping block and the second clamping block are both vertically arranged and located on the two sides of the filtering piece, the bottoms of the first clamping block and the second clamping block are both connected with the top of the wastewater pool, the tops of the bottoms of the first clamping block and the second clamping block are used for abutting against the filtering piece, and the rotating mechanism is located above the wastewater pool; the rotating mechanism is connected with the first clamping block and used for driving th