This article introduces the placing signage and the high-voltage trigger system of the extracorporeal cardiac shock wave treatment instrument. The placing signage is composed of a solenoid coil, a cylindrical sheet metal and a parabolic reflection cup. The cylindrical sheet metal is pushed sharply by electromagnetic force to generate a shock wave which can treat the myocardial ischemia symptoms with its mechanical force and cavitation in human tissues. The energy output formula of the placing signage is derived. The trigger system provides high-voltage electrical impulses to the electromagnetic coil to cause an electromagnetic induction of the placing signage. The trigger system includes high-voltage booster module, voltage control module, energy storage capacitor array, high voltage switch module, charging counting module and mixed signal processing module. The energy range of the shock wave is 2 similar to 7 J and the energy density of the focus is 0.004 similar to 0.413 mJ/ mm(2). The extracorporeal cardiac shock wave system developed in this paper can emit stable period, narrow pulse width, low energy and high pressure shock wave.