The invention discloses an all-weather thermal management system for a battery and a working method thereof. When a lithium battery pack is in a low temperature condition, a phase change material in atemperature control plate and a circulating pipe is solid, and then the battery pack is heated by an external heating or an internal heating mode, wherein the solid phase change material plays a roleof heat preservation and heat storage; and when the lithium battery pack is in a low temperature condition, the solid phase change material is used for heat preservation and heat storage. When the lithium battery pack is in the high temperature condition, the phase change material in the temperature control plate and the circulating pipe is liquid, and the circulating pump is turned on to drive the liquid phase change material to flow out of the upper fluid port or the lower fluid port of the temperature control plate, and then flow back into the temperature control plate to carry out the liquid cooling and heat dissipation process of the lithium battery pack after dissipating heat at the heat exchange tube pack. Therefore, the invention can realize battery thermal management under all-weather conditions, effectively ensure battery capacity, prolong battery service life, simplify the thermal management system under all-weather conditions, and has the advantages of wide application range, energy saving and environmental protection, simple structure, long service life, stable and reliable operation and the like.