Warming device for LNG low-temperature gas cylinder liner and automatic warming system

The invention discloses a warming device for an LNG low-temperature gas cylinder liner and an automatic warming system. The device comprises a supporting mechanism, a main linear moving module and a warming mechanism, wherein the main linear moving module is arranged on the supporting mechanism, the warming mechanism is arranged on the main linear moving module, the warming mechanism comprises a warming frame, a side warming gun, a first end face warming gun and a second end face warming gun, the first end face warming gun and the second end face warming gun are arranged at the two ends of the warming frame in a swinging mode, the side warming gun is arranged between the first end face warming gun and the second end face warming gun, an auxiliary linear moving module is arranged on the warming frame, the first end face warming gun or the second end face warming gun is arranged on the auxiliary linear moving module, the automatic warming system comprises a V-shaped roller bed machine for conveying liners and a