The utility model provides a step angle bead used in an electrical equipment placement chamber. The step angle bead comprises an angle bead body which is buckled to the edge of a corner where a step stretches outward, and a connecting part, wherein the angle bead body is fixed to the step through the connecting part. Due to the arrangement of the angle bead body, the edge of the corner where the step stretches outward is shielded by the angle bead body, when the position is impacted by external force, the angle bead body can bear impacting force, it is avoided that the step is directly impacted by the external force, the service life of the step is prolonged, and using safety of the step is improved. When the angle bead body is abraded seriously, a worker does not need to maintain the position, the electrical equipment placement chamber can be normally used when it is only needed that angle bead is replaced with a new one, the labor intensity of the worker is relieved, maintaining difficulty is reduced, and the attractiveness of the step is guaranteed.