The utility model relates to a floating-type propeller provided with a helical cavity and a ship equipped with the propeller. The propeller comprises the helical cavity; an axial hole is formed in the axis of the helical cavity; a multilineal helical blade is arranged at the periphery of the helical cavity; and a helical blade cavity is formed inside the helical blade. The ship comprises a ship body, a tail vane, a power device and a transmission mechanism, wherein the tail vane is mounted at the tail end of the ship body; the power device is mounted on the ship body; two floating-type helical cavity propellers which are parallel to each other and arranged at front and back axially are mounted at two sides below the ship body symmetrically; spindles of the floating-type helical cavity propellers are rotationally connected below the ship body through brackets; and one end of each spindle is in transmission connection with the power device through the transmission mechanism. The floating-type propeller and the ship have the advantages that the structure is simple, complete sealing is achieved, both buoyancy and power can be generated simultaneously, therefore, the resistance force of water vehicles can be reduced greatly, the running speed of the water vehicles are boosted, and energy and manual labor are saved.