The utility model provides an outlet pipe and drainage system, wherein, this outlet pipe, include: the main road goes out water portion and goes out the bypass play water portion that water portion is connected with the main road, wherein, main road play water portion includes: the setting goes out the inside main drainage route of water portion at the main road, the bypass goes out water portion and includes: the setting inside the bypass goes out water portion, and with the subsidiary drainage route of main drainage route intercommunication. The utility model provides an outlet pipe has improved the life cycle of outlet pipe, has reduced the influence that unusual stopping production brought, guarantees that oil gas field production can the normal clear.