Power supply and distribution method for long-distance small-diameter tunnel secondary lining construction

The invention discloses a power supply and distribution method for long-distance small-diameter tunnel secondary lining construction. A power supply and distribution system comprises a commercial power transformer, a main cable, a rail-mounted automatic voltage boosting and stabilizing device, a low-voltage power distribution trolley and secondary lining construction electric equipment, and the whole power supply and distribution process consists of two stages, wherein the first stage is a normal power supply range of the commercial power transformer, and electric energy passes through a primary distribution box outside a tunnel to the low-voltage distribution trolley through the main cable, and then passes through a secondary distribution box and a tertiary distribution box on the low-voltage distribution trolley to reach the secondary lining construction electric equipment; and in the second stage, the normal power supply range of the commercial power transformer is exceeded, the electric energy passes thro