The utility model relates to a tunnel construction equipment field provides a cable groove formworking jumbo, including platform truck, template and form setting positioning mechanism, the platform truck includes truss structure, walking beam -and -rail and truss location structure, and the truss structure includes horizontal truss and vertical truss, and the walking beam -and -rail is installed in the below of vertical truss and is coordinated with the gyro wheel, the template is including lieing in the inner formword of the below of horizontal truss, outer inner formword and outer exterior sheathing, form setting positioning mechanism is including hanging location pull rod, horizontal location ejector pin and horizontal location pull rod, it has three groups to hang the location pull rod, all installs in horizontal truss, the horizontal location ejector pin includes a set ofly, its both ends respectively with inner formword and outer inner formword fixed connection, the horizontal location pull rod includes a set ofly, all installs in vertical truss. Utilize each locating lever to fix a position the template, substitute manual fixing, make the template stable firm when the pouring, the circumstances of mould or deformation can not appear running, the improvement efficiency of construction. Be applicable to tunnel cable groove's construction.