The utility model discloses an adopt multi -functional sewage treatment system of bio -aeration technique, including former pond, the sedimentation tank, bological aerated filter and disinfection pond, former pond is absolute construction with the pond of disinfecting, sedimentation tank and bological aerated filter fixed connection, former pond, the disinfection pond, fixed connection's sedimentation tank and bological aerated filter below all are equipped with portable steelframe, former pond and sedimentation tank are through portable conduit intercommunication, sedimentation tank and bological aerated filter fixed connection's pool wall upper portion is equipped with the slit, through portable drainage pipe intercommunication between bological aerated filter and the disinfection pond, former pond, the sedimentation tank, bological aerated filter makes by transparent hard material with the pond of disinfecting. The utility model discloses possess multiple functions, can carry out real sewage treatment experiment, can be used to the emergency treatment of small -size sewage factory again, can test the biological filter material of research development, disinfectant etc. Simultaneously, realize diversified the application.