The invention provides a fixture for shell assembly. The fixture comprises a first workbench, a second workbench, a limit translation mechanism as well as a lifting mechanism, a limit rotation mechanism and a clamping mechanism which are sequentially connected. The first workbench and the second workbench are used for vertically placing shells; the lifting mechanism is used for driving the limit rotation mechanism and the clamping mechanism to lift; the limit rotation mechanism is used for driving the clamping mechanism to vertically rotate 180 degrees; the clamping mechanism is used for clamping a first shell located on the first workbench; and the limit translation mechanism is used for translating a second shell located on the second workbench. According to the fixture provided by the invention, the shell assembly efficiency is increased, the rejection rate is lowered, the accident of glue overflow occurring in manual assembly is avoided, and the problems of high labour intensity, low working efficiency and low automation level existing in manual assembly in the prior art are further solved.