The invention relates to the technical field of ships, in particular to an axial-flow type water-jet propulsion pump, comprising a first impeller chamber, a second impeller chamber, a delivery pipe, an inner pipe, a propeller cap, bearings, an impeller shaft, an impeller, guide vanes, diversion fins, a jet nozzle, an oil seal and a counter-jet port, wherein the first impeller chamber is connected with the jet nozzle through the second impeller chamber and the delivery pipe sequentially, the jet nozzle is connected with the counter-jet port, the outer wall of the inner pipe is fixed in the delivery pipe through the guide vanes, the two ends of the inner pipe are respectively provided with one bearing, the two ends of the inner pipe are connected through the oil seal and the propeller cap respectively, one end of the impeller shaft penetrates through the two bearings, the other end of the impeller shaft sequentially penetrates through the second impeller chamber and the first impeller chamber, the impeller is arranged on the impeller shaft, the inner side of the delivery pipe is fixedly provided with at least three guide vanes along the circumferential direction at equal distance, and the inner wall of the jet nozzle is fixedly provided with the diversion fins with the same quantity as the guide vanes. The axial-flow type water-jet propulsion pump provided by the invention has the advantages of high propelling efficiency, anti-cavitation performance and compact structure.