The invention relates to the technical field of cleaning ships, in particular to a ship frame of a water surface cleaning ship, which comprises two sets of receiving brackets arranged symmetrically, first bone beams arranged in parallel, a second bone beam, a third bone beam, and mounting brackets for mounting propeller motors; The receiving bracket comprises a first support beam, a second supportbeam and a first vertical bar; The first support beams of the two groups of receiving brackets are connected through two third connecting rods; The mounting bracket includes a first mounting beam, asecond mounting beam and a mounting bracket. The invention has simple structure and is advantageous in lightening the whole ship weight, and the ship frame structures are mutually supported, so that the ship frame bears increased load and is not easy to deform, and the service life of the ship frame is prolonged; The first connecting rod and the second connecting rod exert opposite forces on the first vertical rod to make the connection of the first vertical rod more stable; In addition, the mounting bracket for mounting the underwater motor is added, and the mounting strength of the underwater motor is increased.