The present invention relates to a floating movement pump which is equipped itself with an engine to execute mobile nozzle-line irrigation in large scope. The floating movement pump comprises an engine and a water pump connected to the power take-off shaft thereof, which constitute the whole bolt body. The water pump has a water inlet which locates under the light loading water line during operation and a water outlet in butt-joint with an outlet pipe. Two or more demountable floating bodies in one group are fixed surrounding all around of the water pump to ensure that the engine show itself relatively fully at outside of the floating body, then the dissipating heat effect in air is improved; the detachable design between the whole bolt body and each floating body causes than the maintenance and servicing is more convenient than the existing technology; at the same time, the underwater part of the whole bolt body locating in water instead of the floating body separating water realizes water-cooling dissipating heat. |