Integrated wastewater treatment equipment adopts A/O process, A2/O process, or A/O-MBR process, combining biological degradation, wastewater sedimentation, disinfection (optional as needed), and other processes into a single system for the treatment of domestic wastewater and industrial wastewater similar to domestic wastewater. The equipment features a compact structure, small footprint, and can be fully installed underground. It operates economically, offers strong resistance to shock loads, achieves high treatment efficiency, and ensures easy management and maintenance. The treated wastewater maintains stable quality, meeting the Class A or B standards of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB18918-2002). The equipment can be buried underground or installed above ground, with treatment capacities ranging from 24 to 500 m³/d. For capacities exceeding this range, special customization is required.