The invention discloses a device and method for loading cells into a shell. The device is used for automatically loading multiple cell modules into the shell, and comprises a platform, a first reference part, a second reference part and a clamping structure, the first reference part and the second reference part are oppositely installed on the platform, the clamping structure is installed on the platform and located between the first reference part and the second reference part, and the clamping structure comprises two oppositely installed clamping blocks. The invention further discloses the method for loading the cells into the shell. The method is applied to the device for loading the cells into the shell. According to the device and method for loading the cells into the shell, an aluminum shell is loaded and attached to the first reference part, the clamping structure clamps the aluminium shell, after an opening formed in the upper portion of the aluminum shell is opened, the multiple cell modules are put into the opening in sequence and pushed to the right positions, automatic operation is conducted in the whole process, the quality and efficiency for loading the multiple cellmodules into the shell are improved, the production security is improved, and the labor cost and working strength are lowered.