The invention discloses a portable valve heat preservation sleeve. The portable valve heat preservation sleeve comprises a main body belt, an auxiliary belt and heat preservation liners, wherein the main body belt and the auxiliary belt are perpendicularly connected with each other, and the heat preservation liners are arranged on the main body belt and the auxiliary belt. Hooking belts are arranged at the upper end and the lower end of the main body belt in a staggered mode, a hooking belt is arranged on one side of the auxiliary belt, and velvet belts are correspondingly arranged on the outer surface of the main body belt and the outer surface of the auxiliary belt. In the process of replacing or dismounting a valve, a worker only needs to untie the hooking belts, and the dismounted heat preservation sleeve can be reused for heat preservation of other types of valves. According to the portable valve heat preservation sleeve, practicability is enhanced, and production cost is reduced.