A high-efficiency multi-atomization arc pistol comprises an insulating pistol body, a connecting plate, a central Laval nozzle, a conductive nozzle, an internal conical atomizing nozzle, a nozzle frame, an annular gas chamber, an external atomizing nozzle and an arc retaining cover. Ventilation holes are arranged on the end surface of the external atomizing nozzle, the axial line of the conductive nozzle is intersected with the axial line of the central Laval nozzle at the central position of an outlet of the arc retaining cover, a conducive pipe is connected to the inside of the embedded conductive nozzle and communicated with a conductive block sleeved at the rear end of the insulating pistol body, a wire feeding pipe joint is arranged at the tail of the conductive pipe, a mounting joint is embedded to the center of the rear end surface of the insulating pistol body, and a first gas inlet joint communicated with the central Laval nozzle is arranged at the bottom of the insulating pistol body. The high-efficiency multi-atomization arc pistol changes an atomized gas flow field and the flow rate by dividing one or two paths of inlet gases into quadruplicate atomized gas flows, leads the atomized gas flow field to be reasonably distributed, improves jet flow speeds and atomization effects of spray particles, realizes smaller and more uniform atomized particles, reduces void ratio of coatings, and obtains larger spraying width.