The invention relates to a building device, in particular to a scaffold for building. The scaffold comprises a whole bracket, a power mechanism, a transmission mechanism, a worm mechanism, movement mechanisms, a control mechanism, a lifting mechanism, a lifting plate, a touch front plate, a touch rear plate, a connecting rod I, a connecting rod II and a shifting fork. The scaffold can move, ascendand descend through power switching on the power mechanism; when the control mechanism is clamped at the upper end of a W-shaped clamping body, a sliding side tooth II and a power belt wheel on the power mechanism are engaged, and the lifting mechanism moves; when the control mechanism is clamped at the lower end of the W-shaped clamping body, the sliding side tooth II and a power gear on the power mechanism are engaged, and the movement mechanisms move to move the scaffold; and when the scaffold encounters obstacles during moving, the touch front plate or the touch rear plate squeezes a compression spring I or a compression spring II to push the shifting fork to move, a sliding side tooth I and a side tooth on the power mechanism are disengaged, power on the power mechanism is switched off, and thus the effect of protecting the scaffold is achieved.