Long-term bearing platform

A long-term bearing platform comprises a platform body and a perpendicularity adjusting device. The perpendicularity adjusting device comprises a height adjusting device, a transition frame, an outer sleeve, at least two auxiliary bearing devices and a base. The bottom of the height adjusting device is arranged on the base, the height adjusting device is sleeved with the outer sleeve, and the outer sleeve can be driven by the height adjusting device to move upwards. The transition frame is placed above the height adjusting device, the top of the transition frame is fixedly connected with the bottom of the platform body, and the bottom of the transition frame is fixedly connected with the upper connecting face of the outer sleeve. The base is placed below the outer sleeve. The heights of the two auxiliary bearing devices can both be adjusted, the upper ends of the two auxiliary bearing devices are both borne on the lower connecting face of the outer sleeve, and the lower ends of the two auxiliary bearing devices are both arranged on the base. The two auxiliary bearing devices are placed on the two sides of the height adjusting device respectively. According to the long-term bearing platform, the perpendicularity adjusting device can be replaced in an on-line mode, and the bearing state can be switched.