The invention belongs to the technical field of battery grouping, and relates to a connecting method for a multiple-battery module combination. The connecting method comprises the following steps: firstly, inserting a surface end part connecting plug at the edge part of the bottom of a battery module at the bottom layer, connecting the intermediate part by using a surface intermediate connecting plug; then inserting a module end part intermediate connecting plug at an edge part of the top of the battery module at the bottom layer, connecting the center part by using a module middle intermediate connecting plug; and then correspondingly inserting the bottom of a battery module at the upper layer above the battery module at the bottom layer in a bolt of the module middle intermediate connecting plug at the top of the battery module at the bottom layer, wherein the top of the battery module at the upper layer above the battery module at the bottom layer is in a structure which is the same as that of the top of the battery module at the bottom layer, and the top of the battery module at the uppermost layer is the same as the bottom of the battery module at the bottom layer in structure. The multiple-battery module combination is simple in structure, convenient to operate, safe to use and flexible and convenient to dismount, misplacing among modules due to bumpy vibration is avoided, and electrodes between the battery modules are reliably connected.