The utility model belongs to auxiliary tools of an airplane, and particularly relates to an auxiliary working ladder for a rear equipment compartment of an airplane. The auxiliary working ladder comprises a support, a lifting frame and a workbench, wherein the lifting frame is movably supported on the support and does lifting movement between the initial position and the working position relatively to the support; the workbench is positioned at the top of the lifting frame and provided with a skylight communicated with the lifting frame and a workbench top capable of enabling an operator to stand on; at the initial position, at least one part of the lifting frame is retracted back to the support so as to facilitate storage; and at the working position, at least one part of the lifting frame extends out of the support so as to enable the workbench to enter the rear equipment compartment of the airplane. The lifting frame can do lifting movement relatively to the support arranged on the ground, so that the workbench can be conveniently conveyed in the compartment to achieve the working height, and in not use, the lifting frame can be retracted back to the support so as to reduce the occupation space due to storage.