The technology of pulsed water jet has a good application prospect in the field of hard rock crushing.To improve the rock breaking efficiency of pulsed water jet, a method of supercharged pulse water jet generation was proposed to obtain a higher pulse pressure at a lower input pressure.Based on high-speed camera technology and pressure dynamic test methods, a visualization test system of the external flow field of the pressurized pulsed water jet was set up, the pulsation characteristics of the supercharged pulse water jet were studied from four aspects: jet pressure, pulse frequency, morphology and structure evolution.The results show that the supercharged pulse water jet is a combined jet composed of low pressure continuous jet section and high pressure pulse jet section, the size of jet pressure shows that pulsating change with time and the amplitude of the pressure pulsation is adjustable, in which the peak pressure of pulse jet increases with the increase of the oil inlet pressure, irrelevant with the initial pressure of the booster chamber; while the pulse frequency increases as a power function with the increase of the inlet pressure, it eventually tends to be stable as the initial pressure of the pressurizing chamber increases; there are four distinct stages in the evolution process of jet form cycle: continuous jet stage, pulse jet generating and developing stage, pulse jet stabilization stage, pulse jet dismissing stage, and its structure exhibits multi-stage pulsation characteristics.The research results lay a foundation for further research and application of supercharged pulse water jet.