The invention discloses a preemptive hydraulic support with a rotatable self-resetting top beam and an installing method and protective technology thereof. The body structure of the support comprisesa base, a stand column, the stop beam, a stand column and base fixing clamping buckle and a top beam rotatable self-resetting mechanism; the base comprises a base body, a stand column left side pressing block and a stand column right side pressing block; the stand column comprises a stand column cylinder body, a stretchable rod body and a stand column bulb; the top beam comprises a top beam body,a stand column nest, a top beam rotatable self-resetting mechanism limiting plate, a top beam rotatable self-resetting mechanism fixing pin hole and a pin shaft fixing clamping groove; the top beam rotatable self-resetting mechanism comprises a stand column bulb limiting ring and a reset elastic washer. According to the preemptive hydraulic support with the top beam rotatable self-resetting, large-angle rotation can be achieved when the support top beam adapts to the roadway top plate conditions, after the support descends, the posture of the top beam can reset automatically, and the problemsthat an existing preemptive hydraulic support has the poor roadway roof plate connection effect, the supporting efficiency is low, a top beam pin shaft is likely to break, and the top beam falls downcan be better solved.