The invention belongs to the technical field of herringbone ladders, and particularly relates to a herringbone ladder for building interior decoration. The herringbone ladder comprises a seat plate, pedals, a frame body, a swing mechanism, a spring and a supporting rod. According to the herringbone ladder, in the using process, a user sits on the seat plate to work, when the user needs to walk, the user only needs to step on a pressing plate, so that the pressing plate swings relative to a supporting plate, the pressing plate swings to drive the swing mechanism on the lower side to swing, and the herringbone ladder is driven to move in a swing mode. In the using process, a brake mechanism is controlled to carry out friction braking on walking wheels at the lower end of the herringbone ladder, so that the brake function of the herringbone ladder is achieved, and the herringbone ladder can be fixed and stopped when walking to a specific position. In the using process, a steering mechanism is used for controlling universal wheels at the lower end of the herringbone ladder to rotate, so that the steering function of the herringbone ladder is achieved, and the flexible application of the herringbone ladder in the using process is guaranteed.