A positive load alignment mechanism comprises a platform device in which are disposed a plurality of driving devices, movable devices and movable bearing platforms. The driving device is connected to the movable device, and the movable bearing platform firmly supports a movable platform of the platform device. The driving devices are used to drive the movable devices to perform the back-and forth or left-and-right or rotating movement, and the movable bearing platforms firmly support the movable platform. By such arrangements, it can achieve the objectives of high pressure resistance, simplified structure, high security, high accuracy and all-direction displacement.