The utility model discloses a steel arch trolley suitable for a tunnel micro-step excavation method. The trolley comprises a trolley walking crawler belt, a platform and a trolley frame, the bottom ofthe trolley frame is fixedly connected with the top of the trolley walking crawler belt, a longitudinal moving trolley is installed at the top of the trolley frame, a trolley lifting oil cylinder isinstalled at the bottom of the trolley frame, and a longitudinal moving driving chain is fixedly connected to the bottom of the longitudinal moving trolley. The utility model discloses a steel arch trolley suitable for a tunnel micro-step excavation method. A longitudinal moving trolley is mounted at the top of a trolley frame; the number of installation operators is greatly reduced, semi-automatic construction of steel arch installation is achieved, the construction intensity of the operators is reduced, the crawling ladders are fixedly connected to the two sides of the surface of the platform, the installation position of the steel arch can be finely adjusted in the vertical direction, and other operations except for steel arch installation, such as tunnel early-stage auxiliary construction, can be conducted.