The invention discloses a power cable storage device of a portal crane. The power cable storage device of portal crane comprises a supporting frame, a plurality of cable clamping plates for storing power cables, and a fixing seat for fixing the cable clamping plates; one end of the fixing seat is fixedly connected with the supporting frame, and the other end of the fixing seat is connected with one end of one of the cable clamping plates; and the multiple cable clamping plates are connected through hinge pins. During application of the power cable storage device, the cable clamping plates for storing the power cables are fixed to the supporting frame through the fixing seat, thus, the cable clamping plates can move along with movement of the supporting frame, the power cables can automatically move along with moving of the cable clamping plates, and storage of the power cables of the portable crane can be completed without manual dragging; accordingly, the working efficiency is improved, and the situation that the power cables are damaged and a short circuit phenomenon occurs due to the fact that the power cables are rolled by traveling wheels of the portable crane is avoided; and the cost is reduced, the structure is simple, and operation is convenient.