The utility model relates to a shield tunnel mid -board construction trolley car belongs to shield tunneling construction equipment technical field, th, be formed with mid -board pouring cavity between the template, one side that mid -board pouring cavity was kept away from to the template is provided with the portal, portal and template are taken off the subassembly and are connected through propping, the portal includes portal crossbeam and portal stand, the portal is connected with horizontal support. The utility model has the advantages of adopt door -shaped structure to support with horizontal, when solving the platform truck problem of turning on one's side, can supply engineering vehicle current.