The invention discloses a construction process of a pile-first-method sleeving type jacket of an offshore wind power booster station. The construction process comprises the following steps of positioning a pile stabilizing construction platform, inserting and driving auxiliary piles, fixing the pile stabilizing construction platform, sinking steel pipe piles, carrying out steel pipe pile rock-socketed construction, dismounting the pile stabilizing construction platform, mounting the jacket, carrying out jacket grouting, carrying out foundation anti-scouring protection and connecting a boosterstation platform and the jacket, when the pile stabilizing construction platform is positioned, the pile stabilizing construction platform and the auxiliary piles are transported to a construction site through a transport barge, the pile stabilizing construction platform passes through the barge to a platform positioning ship to be leveled, when the auxiliary piles are inserted and driven, a craneship is matched with a vibratory hammer for construction, when the pile stabilizing construction platform is fixed, the pile stabilizing construction platform and the four auxiliary piles are temporarily welded and fixed, and when the jacket is mounted, a cross-shaped portal frame arranged at the top of each pile leg sleeve in advance is placed at the top of the corresponding steel pipe pile. According to the construction process, the construction efficiency can be effectively improved, the construction quality is ensured, and the offshore construction period is shortened.