In order to solve the problem that the existing offshore workover platform is expensive and cannot meet the need of workover operation, the mobile workover module of the offshore platform is designed and developed. The workover module can make continuous two-way movement in the marine platform among the multiple well groups, achieve double-side workover to change the existing single-well workover mode, and implement a set of modular workover treatment equipment for multiple-offshore-platform, multiple-well-group workover tasks. Compared with mobile workover operation platform, construction, installation and maintenance costs of the mobile workover module are reduced greatly, realizing the operation synergy, developing new patterns and new ideas suitable for the marginal oilfield workover.