Valve opening and closing device of underground fire hydrant

The utility model relates to the field of fire hydrants, in particular to an underground fire hydrant valve opening and closing device which comprises a hollow valve rod sleeve body, a valve rod sleeve matched with a fire hydrant valve rod is arranged on the lower portion of the valve rod sleeve body, and an extension rod penetrates through the upper portion of the valve rod sleeve body. A partition plate for separating the valve rod sleeve and the extension rod is arranged in the valve rod sleeve body, and a telescopic spring is arranged between the bottom of the extension rod and the partition plate; a connecting pipe is fixed to the upper end of the extension rod, and handles are fixed to the two ends of the connecting pipe. The valve rod sleeve body is provided with an anti-retreating nail for preventing the extension rod from being separated from the valve rod sleeve body; an adjusting screw is arranged on the valve rod sleeve body, and a plurality of adjusting blind holes matched with the adjusting scre