The invention provides a metal shell of a lithium battery. The metal shell comprises a lower shell and a battery cover, and the battery cover is mounted on the lower shell in a buckling connection manner. The invention can solve the problem that the battery disengagement caused by bumping in a vehicle driving process of a battery installed in an existing battery shell causes a condition that a vehicle cannot continue to run, a problem that a lot of jolts cause mutual collision of battery pieces and the service life of a battery is reduced, a problem that the battery shell is low in applicability due to a fact that the battery shell cannot adapt to battery models required by different vehicles because the internal space of the existing battery shell is fixed and only batteries of corresponding models can be mounted. The battery shell can achieve the functions of reducing the collision of a battery pack in the battery shell and prolonging the service life of the battery pack, and has theadvantages of reducing the collision of the battery pack in the battery shell, prolonging the service life of the battery pack, facilitating the installation of different types of batteries, having wide applicability and the like.