Flat shaftless propeller applied to small unmanned ship

The flat shaftless propeller applied to the small unmanned ship comprises a first shell, a protection plate and a limiting block, a second shell is installed below the first shell, bolts are installed on the first shell and the second shell, the tooth surface of a first bevel gear is meshed with a second bevel gear, and the second bevel gear is meshed with a second bevel gear. A transmission shaft penetrates through the second bevel gear, a first belt wheel is arranged on the transmission shaft, a transmission belt is mounted on the first belt wheel, a second belt wheel is connected to the other end of the transmission belt, a propeller is fixed in the second belt wheel, a through groove is formed in the lower portion of the second shell, and a filter screen is mounted on the outer side of the through groove. According to the flat shaftless propeller applied to the small unmanned ship, the second shell is arranged to be flat, so that the horizontal occupied space can be reduced when the flat shaftless propell