The utility model relates to the technical field of valve body equipment. The utility model relates to a valve, in particular to a heat-preservation jacket angle valve. The valve comprises a left halfvalve, a right half valve, a heat preservation shell and a flange plate. A rear left half channel is formed in the left half valve; a right half channel is formed in the right half valve; wherein theleft half valve and the right half valve are oppositely arranged and are mutually welded to form a valve body; the utility model discloses a heat preservation jacket angle valve. The left half valveand the right half valve are mutually welded to form the valve body; meanwhile, the flange plate on the valve body is also welded; therefore, only half of the valve body needs to be cast; the castingtime of the valve body is greatly shortened, meanwhile, the flange plates can be synchronously manufactured, the production cycle of the valve body is shortened, meanwhile, the heat preservation shellis welded outside the valve body, the first annular cavity is formed between the heat preservation shell and the valve body, media and the like can be introduced into the first annular cavity to preserve heat of the valve body, and the heat preservation effect of the valve body is guaranteed.