The invention discloses a low-temperature fire extinguisher valve structure, and aims at providing a low-temperature fire extinguisher valve structure which is convenient to use, good in sealing reliability and capable of effectively solving the problem that leakage will occur to an existing low-temperature fire extinguisher valve when the fire extinguisher valve is used in a low-temperature environment. The low-temperature fire extinguisher valve structure comprises a valve body, a valve body flow channel arranged in the valve body and a valve element. The valve body flow channel comprises a main flow penetrating through the upper end and the lower end of the valve body and a valve body outlet formed in the outer side face of the valve body and communicating with the main flow channel, a lower port of the main flow channel forms a valve inlet, and the main flow channel comprises a conical valve hole with the inner diameter gradually reduced from the bottom to the top. The valve element is used for controlling the valve body flow channel to be opened and closed. The valve element comprises a valve rod, a valve rod upper sealing ring and a valve rod lower sealing ring, wherein the valve rod is inserted into the main flow channel, the valve rod upper sealing ring is arranged on the valve rod and in sealed connection with the main flow channel, and the valve rod lower sealing ring is arranged on the valve rod and in sealed connection with the conical valve hole. The valve body outlet is located between the valve rod upper sealing ring and the valve rod lower sealing ring.