The invention relates to the field of sewage filtration, in particular to underwater treatment equipment. The underwater treatment equipment comprises a 'Y'-shaped water inlet pipe, a transfer mechanism, a stop mechanism, a first residue containing box and a second residue containing box. The 'Y'-shaped water inlet pipe comprises a main water inlet pipe, a first water inlet pipe and a second waterinlet pipe. The transfer mechanism comprises a sliding rail, a support rod, a first residue containing case and a second residue containing case. The stop mechanism comprises a controller, a first stop unit and a second stop unit. The first stop unit comprises a first air cylinder, a first retaining piece and a first pressure sensor. The second stop unit comprises a second air cylinder, a secondretaining piece and a second pressure sensor. By the underwater treatment equipment, residues can be automatically cleaned at regular intervals.