In order to solve the problems that in the prior art, when a manual semi-automatic bundling manner is adopted for bundling aluminum ingots, the efficiency is low, and the labor cost is high, or a fully automatic bundling device can only perform bundling in a single direction, the invention provides a device used for assisting bi-directional bundling of an aluminum ingot stack automatic bundling machine, comprising a lifting machine, a diagonal bracing, a rotating mechanism, a top plate and a support; the lifting machine is arranged below an upper seat plate of the diagonal bracing; the support is arranged on the top plate; the rotating mechanism comprises a motor, a driving gear, a supporting shaft and a driven gear; the supporting shaft penetrates through the upper seat plate of the diagonal bracing and is fixedly connected with the top plate; the device used for assisting bi-directional bundling of the aluminum ingot stack automatic bundling machine is arranged below a transmission chain at the packaging position of an aluminum ingot continuous casting production line. When the device is used for bundling aluminum ingot stacks, the aluminum ingot stacks can be in bi-directional bundling at bundling positions, so that the bundling efficiency is improved, and the labor cost and the equipment cost are reduced.