A retractable and extendable load cell and a special connection junction are developed for self-balanced test of steel pipe pile. Firstly the special connection junction is welded at the self-balanced position with the steel pipe pile when the pile is set up. Then, the inner soil above the junction is cleaned up and the retractable load cell is set up in the junction, which can load the upper and lower pile segments. Based on the new self-balanced method test of steel pipe pile, we analyze the bearing characteristics for a large-diameter steel pipe pile at Donghai bridge offshore wind farm, in which the gross bearing capacity is obtained as well as the side and base resistance. The results of the study show that the new self-balanced method testing technology achieves a good test effect and economic benefit.