The invention discloses a shock-wave fracture forming device and system. The device includes a ground control terminal, a perforation cable and a high-energy shock wave generator, wherein the control terminal is connected with a shell of the high-energy shock wave generator through the perforation cable, and a cable core body of the perforation cable is connected with a energy storage component of the high-energy shock wave generator. According to the shock-wave fracture forming device and system, high-voltage strong-current electric energy is released instantly in a liquid environment of an oil well, high-temperature plasmas can be generated, are spread in the radial direction in a high-pressure shock wave form and act on oil layers through perforation tunnels of the oil well, a large number of fractures free of crustal-stress control are formed near wellbore areas, at the same time, various pollution blockages near the perforation tunnels are cleaned away. The permeability near the wellbore areas is greatly improved, the pressure conductive ability is reduced, crude oil smoothly flows into a wellbore, and the production increase of the oil well and the injection increase of a water well are achieved.