The invention relates to a double-power two-way composite sealing type low-temperature ball valve, which comprises a valve seat and a valve core. The soft and hard composite seal of a soft and hard combined elastic structure is formed by a metal hard seal, an inner ring soft seal and a butterfly-shaped spring, and connecting end surfaces between the valve seat and the soft and hard seal are supported by the butterfly spring, so that pre-tightening force is generated on the end surfaces, the valve seat is tightly combined with the valve core under the pre-tightening force effect of the butterfly spring, the sealing performance of the valve seat and the valve core is ensured, particle impurities in the fluid can be effectively prevented from entering hard seal gaps through the soft seal, the abrasion between the hard seal valve seat and the valve core is reduced, the service life of the valve is improved, the valve rod adopts a duplex sealing structure, the valve body and the valve rod seal adopt double butterfly-shaped elastic gaskets, the contact pressure between the valve rod and the sealing element is maintained, the sealing performance is improved, the valve rod and the sleeve adopt adjustable elasticity uniform-pressure type pre-tightening seal, the outward leakage of the valve is reduced, the valve is provided with a circular disc for installing electric, hydraulic and pneumatic drivers, an electric, hydraulic and pneumatic driving device can be conveniently installed, and the manual and automatic double-power conversion can be realized.