Launching and using method of underwater relay station

The invention relates to a laying and using method of an underwater relay station. The underwater relay station comprises an outer frame, and supporting legs are installed on the outer side faces in the peripheral direction of the outer frame; the upper ends of the single-group supporting legs are rotatably mounted with the outer frame, rollers are mounted at the bottom ends of the single-group supporting legs, and the supporting legs are driven by the retractable adjusting mechanism to swing outwards to open or draw close inwards relative to the outer frame, so that the underwater relay station can automatically and smoothly move on the ground or a deck under the traction of an external crane. And the device can be expanded relative to the inner wall surface of the moon pool, so that the laying process is smooth and reliable, the damage to a ship body or relay station equipment caused by shaking in the laying process is greatly avoided, the use is convenient, and the practicability is good. 本发明涉及一种水下中继站的布放使用