The invention belongs to the technical field of sewage treatment and specifically relates to a sewage treatment machine. The sewage treatment machine comprises an outer barrel, an inner barrel and a drug barrel, wherein a water injection pipe, a drainage pipe and an interlayer are arranged between the outer barrel and the inner barrel; an upper-layer stirring rod, a middle-layer stirring part anda lower-layer stirring rod are arranged in the inner barrel; a water leaking net for supporting a floc is arranged at the bottom of the inner barrel; the drug barrel is communicated with the bottom ofthe interlayer; a drug injection port opening is formed in the drug barrel; a driving rod, a driven rod and a water drawing mechanism for drawing water in the interlayer into the inner barrel are arranged in the interlayer; a spiral rod is arranged at one end of the driving rod; a bevel gear I is arranged at the other end of the driving rod; a water wheel is also arranged on the driving rod; a bevel gear II, a driving gear, a first bevel gear pair and a second bevel gear pair are also arranged on the driven rod. According to the scheme, the stirring speed can be automatically reduced according to the generation of the floc in a coagulation process, and the coagulation process is simplified.