The invention discloses an energy saving and consumption reducing system of a low-temperature liquefied hydrocarbon storage and transportation station and an adjusting method. In the technical scheme,an outlet of a circulation water station is connected with an inlet of an LPG heater through a circulation water pump, and an outlet of the LPG heater is connected with an inlet of an LPG BOG compression condensation system and an inlet of the circulation water station, and an outlet of the LPG BOG compression condensation system is connected with the inlet of the circulation water station and the inlet of the LPG heater through a circulation water return pipeline; a connecting pipeline of the outlet of the LPG BOG compression condensation system and inlet of the LPG heater is provided with afirst circulation water return flow dividing valve, and a pipeline connected between the outlet of the LPG BOG compression condensation system and the inlet of the circulation water station is provided with a second circulation water return flow dividing valve. The method is simple, convenient, reliable and high in automation degree. The system couples a cold source and a heat source, the structure is compact, the system is suitable for multiple work conditions, and the energy saving and consumption reducing effects are obvious.