The utility model relates to a pipeline type oil-gas-water separation system which comprises an upper layer sleeve structure comprising an upper layer outer pipe and an upper layer inner pipe, a gas phase outlet is formed in one end of the upper layer inner pipe, and a first inlet is formed in the top of the upper layer inner pipe; the middle-layer sleeve structure comprises a middle-layer outer pipe and a middle-layer inner pipe, one end of the middle-layer inner pipe is provided with a liquid inlet, the other end is provided with an oil phase outlet, the top of the middle-layer inner pipe isprovided with a first outlet, and the bottom is provided with a second outlet; the lower-layer sleeve structure comprises a lower-layer outer pipe and a lower-layer inner pipe, one end of the lower-layer inner pipe is provided with a water phase outlet, and the bottom is provided with a second inlet; the first vertical pipe is communicated with the upper-layer outer pipe and the middle-layer outer pipe; and the second vertical pipe is communicated with the middle-layer outer pipe and the lower-layer outer pipe. The pipeline type oil-gas-water separation system completely adopts a pipeline type separation technology, realizes complete separation of oil, gas and water under the action of dynamic gravity separation and shallow pool separation, and has the advantages of small occupied area, high treatment efficiency and the like.