The invention discloses a stable scaffold lifted under the assistance of a hydraulic platform. The stable scaffold comprises a scaffold body, wherein fixing frame plate devices are arranged on two sides of the scaffold body; a fixation supporting plate is fixedly arranged between the bottom ends of the fixing frame plate devices; a hydraulic lifting platform is fixedly arranged at the upper end of the fixation supporting plate; a footboard body is fixedly arranged at the upper end of the hydraulic lifting platform; a concave clamping groove is formed in the inner side plate surface of each fixing frame plate device; two ends of the footboard body are correspondingly clamped into the concave clamping grooves; a plurality of rolling ball bodies are hinged to two end plate surfaces of the footboard body, and are close to the groove surfaces of the concave clamping grooves to roll; and an arc protecting roof is also arranged at the top end of the scaffold body. In such a way, a scaffold footboard can have the function of lifting and moving up and down, so that the height of the footboard body is adjusted under the driving of the hydraulic lifting platform to meet the work requirement on different heights.