The invention relates to a novel multi-plunger-set high-pressure water pump, a high-pressure system to which the water pump is applied and an operating method. The water pump is composed of high-pressure generating assemblies, a pressure maintenance assembly, a mechanical-electronic pressure safety control assembly and an automatic cleaning fluid generating assembly. Four plunges or more are included. Each plunger corresponds to one high-pressure generating assembly. Swash plates in the high-pressure generating assemblies are fixed to the front end of a motor shaft, and the plungers which are evenly distributed concentrically and thrust ball bearings arranged on the swash plates abut against moving coils of the plungers under the effect of plunger springs. Along with rotation of the motor shaft, the swash plates and the thrust ball bearings conduct circumferential motion along the axis of a motor, and the plungers are tightly pressed on the bearings synchronously conduct linear reciprocating motion along with rotation of the bearings. Due to the fact that plungers are concentrically distributed in the circumferential direction, motion positions of all the plungers are evenly distributed on the whole circumference. The problem that a low-voltage induction motor is difficult to start is solved, product performance is improved, and meanwhile a revolutionary breakthrough is brought to the cleaner industry.