The disassembly and assembly of heavy temporary support of overlapped shield tunnel is inconvenient and lowefficient. Hence, a kind of automatic hydraulic support trolley with nonuninterrupted underpass under the condition of unloaded support is designed by analyzing the technical and economic indicators of existing support schemes; and the strength of the automatic hydraulic support trolley with construction vehicle function is checked by finite element analysis software SolidWorks Simulation. By adopting electric control and hydraulic control technology, the new type of hydraulic support trolley, to some extent, realizes the mechanization of shield tunnel support and reduces the labor intensity. Meanwhile, by optimizing the structure of the support trolley, the problem of interference between construction procedures is effectively solved, and the weight and cost of support trolley are reduced. The engineering applicable results of the support trolley to Huaxin StationHuangmugang Station Section of Shenzhen Rail Transit Line No. 7 show that the new hydraulic support trolley can guarantee structural safety of the existing tunnel and improve support efficiency effectively.