The invention discloses a reusable launch vehicle control reconstruction method and system. The method comprises steps that the output information of a sensor is monitored and analyzed in real time; according to the analysis result of the output information of the sensor, the control strategy matched with the analysis result is selected; according to the selected control strategy, adaptive reconstruction of a control system of a reusable launch vehicle is carried out. The method is advantaged in that adaptive reconstruction of the reusable launch vehicle control system in the whole flight taskprocess is realized.