Dropping and pulling type underground small-diameter large-displacement hydraulic pulse supercharging device

The invention discloses a throwing and fishing type underground small-diameter large-displacement hydraulic pulse supercharging device which comprises a fishing head, an upper barrel, an upper water outlet short section with a high-pressure output port channel, a supercharging short section, a lower water outlet short section with a low-pressure output port channel and a lower barrel. The pressurizing short section is provided with a pressurizing part and a hydraulic automatic reversing control valve; the pressurizing part comprises an upper high-pressure piston, a low-pressure piston and a lower high-pressure piston; an upper high-pressure cavity is formed above the upper high-pressure piston; the low-pressure piston vertically forms an upper low-pressure cavity and a lower low-pressure cavity; a lower high-pressure cavity is formed below the lower high-pressure piston; a first oil port of a main valve body of the hydraulic automatic reversing control valve is communicated with an upper low-pressure cavity,