The utility model discloses a septic tank that leakproofness is good convenient to clearance, including main cell body and di chi, the top in end pond is connected with main cell body, and the insidelower extreme in end pond is fixed with the filter plate, the aperture has evenly been seted up at the bottom interval in end pond, the welding of the top of branch has the depression bar, and the depression bar runs through the cover and establishes and cover in the pond. In the carrier roller device, this septic tank that leakproofness is good convenient to clearance, the low -voltage line phasesequence signboard is advantageous in that, it comprises main cell body and end pond, in use, on inserting feces inlet pipe with domestic sewage or liquid dung's delivery pipe, make it discharge on earth in pond and the main cell body, and drive the spiral stirring rod rotation through the motor, thereby make sewage and the separation of great piece rubbish, because the setting of filter plate, sewage permeable filter plate emits into in the ground, secondarily, when used, chi gai is covered on top at main cell body, and chi gai is through fixing in the draw -in groove of branch cutting ferrule on main cell body inner wall.