The utility model discloses a totally-enclosed buffer flow-limiting pipeline type shunting and ore-separating device, and belongs to the technical field of mining industry screening. The device comprises a buffer tank, a flow guide pipe is arranged in the buffer tank, the upper end of the flow guide pipe is connected with an ore feeding port, the lower end of the flow guide pipe is provided with an annular weir, flow dividing holes are formed in the side face of the buffer tank at intervals, the output ends of the flow dividing holes are connected with an ore discharging port, and a flow limiting valve is installed between the flow dividing holes and the ore discharging port. According to the utility model, the buffering and shunting effects are achieved through the buffering box; the problems of overflow, splashing and the like of ore pulp are effectively solved, the production operation environment is purified, ore pulp fluid does not decelerate, ore separation is uniform and flexible in the flow separation process, the key problems of flow separation and ore separation are effectively solved, the whole device is small, the space height is not additionally increased, an externalsupporting platform is not needed, installation and replacement are convenient, and practicability is high.