Four-wheel aligner

A four-wheel aligner, comprising:

• four four-wheel alignment and measuring devices and two four-wheel alignment and calibration devices;
• wherein the four four-wheel alignment and measuring devices are configured to be placed one by one corresponding to sides of the four tires of a vehicle to be aligned, one of the two four-wheel alignment and calibration devices is arranged between two of the four four-wheel alignment and measuring devices located at a side of the vehicle to be aligned, another one of the two four-wheel alignment and calibration devices is arranged between another two of the four four-wheel alignment and measuring devices located at another side of the vehicle to be aligned, and the two four-wheel alignment and calibration devices are configured to be oppositely arranged on two sides of the vehicle to be aligned;
• the four four-wheel alignment and measuring devices are configured to obtain images of the tires and to analyze alignment information of the tires;
• and one of the two four-wheel alignment and calibration devices is configured to calibrate two four-wheel alignment and measuring devices located at a same side of the one of the two four-wheel alignment and another one of the two four-wheel alignment and calibration devices on an opposite side.