A new choking cavitator is proposed on the basis of analyzing the choking cavitation phenomena, which occurs in the straight pipe of gas-liquid two-phase flow, in jet pump under the operating limits, in a cylindrical pipe with a sharp edged-corner for the steady and unsteady flows as well as in a pipe involving an abrupt enlargement of steady-state adiabatic flashing flow. Through the analysis of cavitation noise signals collected and the experiments of treating the simulated wastewater (phenol solution), the preliminary research of the feasibility of choking cavitator in the application of wastewater treatment is carried out. The results show that the effect of treating simulated wastewater with the choking cavitator is obvious, and the cavitation energy produced by the choking cavitator is higher than that by self-oscillated chamber nozzle. Thus provides a new way for cavitator study at home and abroad.