Abstract: Affected by factors such as limited area of the offshore construction platform, high daily cost of equipment operation and high safety risk, many mature horizontal well staged fracturing technologies on land can′t be applied in offshore oilfields. The development level of staged fracturing technology for offshore horizontal wells is also much lower than land oil fields. In this paper, the characteristics of offshore horizontal well fracturing demand are analyzed, and offshore horizontal well fracturing technology direction is clarified. The horizontal well fracturing operation in Brazil, West Africa, North Sea and other offshore oil and gas fields has been extensively investigated. The types of fracturing segmentation technology, operation modes and the development of supporting technologies such as seawater-based hydraulic fracturing fluids and fracturing ships have been sorted out. In order to better solve the unsatisfactory economic benefits of offshore horizontal wells fracturing, the development trend of fracturing technology for offshore horizontal wells is prospected in three aspects: optimization of fracturing parameters design, improvement of staged fracturing tools for horizontal wells and upgrading of seawater-based fracturing fluid. Apparently, it has guiding significance for offshore horizontal well fracturing in the future.