Conveniently maintained efficient sewage treatment device

The utility model relates to a conveniently maintained efficient sewage treatment device. The sewage treatment device comprises a plurality of reaction cylinders which are connected in series by virtue of connecting pipes, the reaction cylinder located at a starting end is provided with a water inlet pipe through which swage enters and the reaction cylinder located at a tail end is provided with a delivery pipe. The conveniently maintained efficient sewage treatment device is characterized in that each of reaction cylinders is arranged on a platform supported by virtue of a support post, a ladder stand enabling people to climb the ladder is arranged at one side of the platform, chemical agent feeding pipes are arranged at one sides of the water inlet pipe and connecting pipes, a horizontal filtration tank is arranged below the platform, a plurality of filtration plates are arranged form bottom to top at intervals inside the horizontal filtration tank, a sewage discharge pipe is arranged at the lower part of t