The invention discloses an assembly device and construction technology for a restraining concrete arch frame. The assembly device comprises a restrained concrete arch frame formwork, a vault adjustingdevice, two adjusting trolleys, and a laser aligning system. A sealed space for pouring concrete is formed in the restrained concrete arch frame formwork, and the vault adjusting device is arranged at the vault position of the restrained concrete arch frame formwork. The two adjusting trolleys are separately used for adjusting and locating two arch legs of the restrained concrete arch frame formwork, the two adjusting trolleys specifically comprise upper clamping components and adjusting supporting components, wherein the upper clamping components are provided with upward opening parts used for clamping the arch legs; and the adjusting supporting components can stretch and retract in the axial direction, the tops of the adjusting supporting components are fixedly connected with the bottoms of the upper clamping components, and the bottoms of the adjusting supporting components is fixedly connected with a load-bearing platform in a rotating mode along the vertical plane. The laser aligning system comprises laser launching receiving devices which are separately arranged on the vault adjusting device and the adjusting trolleys, and the degree of accuracy of the locating of the arch frame is determined based on laser receiving states of each laser launching receiving device and the relationship between the laser receiving states and a vertical positioning hammer arranged on the arch frame.