In the process of cementing the second opening wellbore of shallow surface casing in fractured formation, leakage is prone to occur. It is necessary to prevent leakage through pressure-blocking and leakage-plugging techniques. However, the traditional method of shutting the wellhead is limited in improving the formation’s pressure-bearing capacity and fails to achieve the expected leakage prevention effect due to the restrictions of the fractured pressure at the casing shoe of the shallow surface casing. This article presents the design of a recyclable pressure-blocking and leakage-plugging tool to address the leakage problems in the second opening wellbore of fractured formation. Firstly, the rock mechanics characteristics of fractured formation are analyzed, and the leakage pressure and fracture pressure of the formation are predicted through triaxial stress experiments. Then, a recyclable pressure-blocking and leakage-plugging tool is designed, which achieves sealing and unsealing through magnetic suction and mechanical operation, featuring simple operation, stability, reliability, and reusability. Finally, mechanical simulations under different working conditions are conducted to verify that the tool can withstand an external load of 6 MPa, meeting the pressure-blocking and leakage-plugging requirements for the second opening wellbore in the shallow formation of the Jilin oil region. This research provides a new approach to solve the problem of leakage in the second opening wellbore of shallow surface casing, and the tool has great potential for further development and application.