The invention discloses a pay-per-use management system for an elevator additionally built on an existing building. Multiple elevator equipment systems are connected through a central platform management server to form a local area network. Vein information or face information or voice information of a member is input into the elevator equipment systems selectively, and the member can use the elevator after the central platform management server determines matching after comparison. When limited users need to use the elevator, a mobile terminal scans a collection two-dimensional code on the elevator equipment systems and pays the corresponding access fee, the central platform management server receives the information of successful paying, the limited users obtain the permission of using the elevator equipment system, the information is sent to the corresponding elevator equipment system, and the elevator equipment system controls the elevator to operate. The management way of different users for using elevators additionally built on existing buildings is effectively optimized, convenience is brought to different users, the property management efficiency of each elevator equipmentsystem in the local area network is improved, and the cost is saved.