The invention relates to a water surface cleaning boat for self-flow type collection of a water surface floater. The water surface cleaning boat comprises a boat body, a propulsion device and a storage device, wherein a notch is formed in the head part of the boat body; a mounting groove communicated with the notch is formed in the middle of the boat body; the storage device comprises a storage cabin and a drive mechanism, the storage cabin is arranged in the mounting groove and can rise onto a deck and sink into water, and the drive mechanism is used for driving the storage cabin to perform lifting motion; the storage cabin comprises a cabin bottom, a cabin wall extending upwards from the periphery of the cabin bottom, a cabin door arranged on the cabin wall and positioned close to the front part of a bow and a control mechanism for controlling the cabin door to automatically open and close, wherein water filtering mesh openings are formed in the cabin bottom; the cabin wall can be arranged on the cabin bottom in openable and closable manners. According to the water surface cleaning boat provided by the invention, on one hand, a harvesting device is omitted, so that the structure is simplified, and the cost is reduced; on the other hand, water on the surface of the floater can be drained, so that the endurance of the cleaning boat is improved; meanwhile, the cleaning work of the drained floater is also facilitated, so that the cleaning efficiency is improved.