The utility model provides a system device for fast pouring stand column concrete in small space in a tunnel. The system device comprises a mixing hopper and a trolley. The mixing hopper is shaped like a cone with the large upper opening and the small lower opening. The two sides of the mixing hopper are connected with fixing sleeves. One side of the trolley is provided with a lifting device connected with fork arms. The fork arms are matched with the fixing sleeves. The bottom of the mixing hopper is provided with a through hole. One side, close to the trolley, of the mixing hopper is connected with a fixing plate. One side, towards the through hole, of the fixing plate is sequentially connected with a hydraulic cylinder, a guide plate and a base from top to bottom. A piston rod of the hydraulic cylinder is connected with a baffle matched with the through hole. According to the system device, the two sides of the mixing hopper are connected with the fixing sleeves, one side of the trolley is provided with the lifting device connected with the fork arms which are matched with the fixing sleeves so that the fork arms of the lifting device of the trolley can be inserted into the fixing sleeves of the mixing hopper, and therefore the trolley can be lifted conveniently and move the mixing hopper to a designated position; a ground pump conveying mode adopted in concrete pouring in the construction process of a two-layer structure of the extra-large diameter tunnel is replaced, operation is flexible, convenient and fast, and the occupied space is small.