The utility model discloses a fiberglass integrated septic tank, which comprises a tank body and inlet and outlet ports located on the tank body. The tank body is cylindrical, with an inspection port at the upper part. The tank body is equipped with a partition plate that separates the tank body, and the partition plate is provided with a through hole. This utility model adopts a cylindrical pool body, which has higher strength and stronger pressure bearing capacity compared to other structures. There are no special requirements for backfill soil during installation, and it can also be transported and installed by rolling, simplifying the operation procedure; In addition, by using perforated partitions to divide the pool into multiple compartments and treating sewage in stages, the treatment effect of sewage is improved. The mesh distribution of through holes on the partition can effectively separate each compartment without affecting the flow of sewage. Buffer plates can also be installed at the sewage inlet, anti floating plates can be installed at the outlet, and inspection ports can be set at corresponding positions on the septic tank body to more conveniently observe the capacity of sediment in each compartment and facilitate timely removal.