The utility model provides an inclined drift system which comprises an inclined drift body and a drainage unit. The inclined drift body comprises a first port and a second port, the first port is lower than the second port, and a bottom plate is arranged at the bottom of the inclined drift body. The drainage unit comprises a seepage filter tank and a water collecting well, the seepage filter tank is located under the bottom plate, the side face, facing the first port, of the seepage filter tank is provided with a water blocking wall plate which is arranged in the width direction of the inclined drift body, the top of the water blocking wall plate protrudes out of the bottom plate, the water collecting well is communicated with the seepage filter tank, water in the seepage filter tank can flow into the water collecting well, an air pump is arranged in the water collecting well, and a water outlet of the air pump is communicated with a drainage pipeline. The inclined drift system can guarantee construction progress and production safety.