The invention provides a quick water-free starting device applied to a
centrifugal pump. The quick water-free starting device comprises a one-way channel, a self-suction cavity shell, a sliding device, a self-suction cavity, a concave-convex
impeller, two side
inlet flow channels connected with the self-suction cavity, a spring device of an upper side x-shaped gas-liquid separation device, an upper side x-shaped gas-liquid separation device, an upper and middle side gas-liquid separation device connecting shaft, a middle side gas-liquid separation device, a lower side
backflow type gas-liquid separation device, a v-shaped
backflow flow channel, an inverted v-shaped
inlet flow channel and an inlet which are sequentially arranged from top to bottom. According to the quick water-free starting device, the
centrifugal pump can directly enter the normal operation working condition after water-free starting, and 36 times of exhaust can be completed by rotating an
impeller in a self-suction cavity by a circle in the earlier stage. In addition, the device is provided with an upper gas-liquid separation device, a middle gas-liquid separation device and a lower gas-liquid separation device, gas-liquid separation is fully achieved, gas can be exhausted more quickly, a cavity is filled with water, the working efficiency can be remarkably improved, and the operation process is greatly simplified.