The invention discloses a posture adjusting device. The posture adjusting device comprises a bearing platform, a supporting underframe, a pushing mechanism, a front posture adjusting mechanism and a rear posture adjusting mechanism. The supporting underframe is movably arranged on the bearing platform through the pushing mechanism. The front posture adjusting mechanism and the rear posture adjusting mechanism are arranged at the front and rear ends of the supporting underframe correspondingly. The front posture adjusting mechanism, the bearing platform and the rear posture adjusting mechanismare used in cooperation to achieve adjustment of the front and back, left and right, up and down, the pitch angle, the yaw angle and the roll angle of an object. The posture adjusting device can be used for achieving posture adjustment of the object to be adjusted and is high in adjusting speed and adjusting efficiency.