The invention relates to a treatment device, in particular to a low-consumption town sewage treatment device, and aims to provide a low-consumption town sewage treatment device which is lower in town sewage treatment cost. In order to realize the technical effect, the low-consumption town sewage treatment device is provided and comprises a bracket, a first slide rail, first sliders, a second rotating shaft, a first bevel gear, a second bevel gear, a rotary drum, a contact roller, a connecting rod, a rotary motor and the like; a purifying box is located on the left side of a collecting tank, a water pump is arranged on the right side of the bottom in the purifying box, a hard pipe is connected onto the water pump, the tail end of the hard pipe is located right above the collecting tank, and a second through hole is formed in the left side of the top of the purifying box. The low-consumption town sewage treatment device has the effect of lower sewage treatment cost.