The invention relates to the technical field of tunnel construction, and specifically relates to a tunnel supporting operation trolley. The tunnel supporting operation trolley comprises a platform trailer, a bearing frame and an expansion rack, wherein the bearing frame and the expansion rack are arranged on the platform trailer; an arch mounting arm is arranged on the bearing frame; the expansionrack comprises a lower frame, an upper frame and an object carrying frame from bottom to top; two telescopic lower platforms are symmetrically arranged on the lower frame, and the telescopic lower platforms can extend outwards from the long edge of the lower frame; two telescopic upper platforms are symmetrically arranged on the upper frame, and the telescopic upper platforms can extend outwardsfrom the long edge of the upper frame. The expansion rack includes three layer structures, and the lower two layer structures can expand to form two layer construction platforms with adjustable horizontal positions, and after being contracted, a small space is occupied; the bearing frame treated as the top layer structure can be used for storing an arch section and can be treated as a supporting facility of the arch mounting arm, so that the whole structure of the operating platform is compact and reasonable in arrangement, possesses certain commonality and helps improving the efficiency of construction of tunnel supporting operation.