The invention relates to the field of valves, in particular to a pressure-adjustable high-pressure water pressure reducing valve. A rigid seal sleeve is made of 1Cr18Ni9Ti, corrosion resistance is achieved, strength is high, damage and failure are not liable to occur due to high pressure intensity, pressure can still be adjusted precisely in a bad work environment, and normal use of the pressure-adjustable high-pressure water pressure reducing valve is ensured. Through the compensative adjusting effect of a communicating pipeline, the pressure-adjustable high-pressure water pressure reducing valve can automatically adjust movement of a valve core shaft according to the pressure change of the outlet end, so that constant pressure of the outlet of the pressure-adjustable high-pressure waterpressure reducing valve is kept, and workload of workers due to manual adjustment is lowered.