The utility model belongs to the technical field of sealing, and relates to a low temperature sealing valve, in particular to a low temperature sealing valve of a liquid nitrogen and liquid oxygen system. The low temperature sealing valve comprises a valve body, a lower valve rod, a valve cover, an upper valve rod, a valve handle, a corrugated pipe, a connection ball and a spline-kind guide barrel. The upper sealing of the sealing valve is achieved through the corrugated pipe, so that the zero outleakage rate is ensured; the lower sealing is a double-conical-surface sealing pair with soft sealing and hard sealing combined, the hard sealing surface has high sealing capacity, the soft sealing surface has the high capacity of impurity resistance and deformation resistance, the soft sealing surface and the hard sealing surface avoid the shortcomings and enhance the advantages, and the sealing performance is improved largely. In addition, as the elasticity modulus of different sealing materials are different, and the cone angle ratios of the double conical surfaces are different, the sealing specific pressure of the soft sealing surface and the sealing specific pressure of the hard sealing surface are coordinated by skillfully changing cone angles of the double conical surfaces, the sealing performance of the valve is improved largely, and the problem of inner leakage of the valve is solved.