The invention belongs to the technical field of special construction, and provides a grouting technology for offshore wind power jackets. The grouting technology comprises the following steps: 1) after pipe piles are built at sea and a jacket is mounted at sea, leg columns of the jacket are connected with the pipe piles in a sleeving manner, and circular spaces are defined by the leg columns of the jacket and the pipe piles; 2) the bottoms of the circular spaces are plugged, and grouting pipelines communicated with the circular spaces are arranged; 3) a grouting material is pumped for grouting via the grouting pipelines, so that grouting is conducted on the circular spaces; 4) after the circular spaces are fully filled with the grouting material, the grouting material in the circular spaces is allowed to stand still for a certain time, and then pressure-keeping grouting is carried out; 5) after pressure-keeping grouting, grouting is stopped, and maintenance is carried out. The grouting technology has the advantages that the domestic blank is filled up; technological progress is promoted; the engineering application effect is favorable; the grouting technology can be widely applied to offshore wind power foundation construction, offshore platform jacket structure maintenance and reinforcement, and the like, thereby having significant meaning in promoting China offshore wind power foundation construction.