The invention discloses a method for acquiring electro-hydraulic pulse shock wave intensity under a high static pressure. An electro-hydraulic pulse shock wave emitter performs gap discharge on liquidthrough a pulse capacitor, and shock waves are outwardly radiated through quick expanding of a cavity and electric arc. The electro-hydraulic pulse shock wave emitter normally operates in deep sea orland environments, the static pressure around the electro-hydraulic pulse shock wave emitter is increased along with increasing of operating depth, and the shock wave intensity is largely different from that under a normal pressure due to influences of static pressure in a discharge process. A shock wave generation process includes a prebreakdown process and a main discharge process, and energy loss in the prebreakdown process is calculated according to a relationship of variation of prebreakdown delay along with the static pressure. Influences of the static pressure on liquid density, shockwave propagation speed and cavity expanding rate are considered on the basis of the fluid mechanics equation, energy deposition of arc channels under different static pressures is calculated, and inversion of efficiency in conversion of electric energy into mechanical energy in the main discharge process is realized. Further, by integrating of the two processes, the relationship of variation of shock wave intensity along with the static pressure is obtained.