The invention discloses an emergency posture control method and system. The method comprises the steps that lower limb movement parameters are obtained and comprise a knee joint ankle parameter, a knee joint ankle change parameter, ankle joint pressure parameter and an ankle joint pressure change parameter; the movement cycles which a lower limb auxiliary device is in are marked according to the lower limb movement parameters and comprise a walking supporting cycle and a walking swing cycle; and corresponding control instructions are output for controlling a hydraulic power device based on themovement cycles, the knee joint ankle change parameter and/or the ankle joint pressure change parameter. The system is used for implementing the method. Corresponding movement configuration files areloaded according to the lower limb postures, corresponding knee joint ankles and/or ankle joint pressure changes can be handled in a targeted mode, and the corresponding proper instructions are output for controlling the hydraulic power device to assist in walking of people.