The utility model relates to a portable cross-brace ladder. The portable cross-brace ladder mainly comprises a ladder body, a hook, clamping grooves, a plurality of pull rings and a hinge, wherein the ladder body is in a shape like the Chinese character mu (meaning eye), the upper section and the lower section of the ladder body are connected with each other by the hinge, and a group of clamping grooves is formed in each of two sides of the upper section and the lower section of the ladder body; the top end of the hook is bent, and the lower end of the hook is fixedly connected with the ladder body; the plurality of pull rings are fixed on two sides of the ladder body in a staggering mode. When the portable cross-brace ladder is used, a worker climbs to a lower anchor ear of a cross brace by using a pick-up hook, then takes over the cross-brace ladder handed by a coworker on the ground, spreads the ladder out and fixes the ladder on the cross brace by using the hook and the clamping grooves, and subsequently steps on transverse bars of the ladder, thus operating on the cross brace. The cross-brace ladder disclosed by the utility model has the advantages that the structure is simple, the safety is high, the operation is convenient, the working efficiency is improved, and the labor intensity is reduced and the like; the operation time consumed by using the cross-brace ladder is reduced by about 90 percent compared with the traditional operation.