The invention discloses a medicine addition device for sewage treatment equipment. The medicine addition device structurally comprises a control box, a display screen, operating buttons, a medicine addition stirring mechanism, a water passing tube, a fixed rack, a medicine storage barrel, a medicine inlet tube and a medicine passing tube, wherein the medicine addition stirring mechanism is arranged at the top end of the medicine storage barrel; the medicine storage barrel and the medicine addition stirring mechanism are of an integrated structure; the medicine addition stirring mechanism consists of a heat radiation fan, a transmission device, a conveying device, a switch device, a material storage device, a pushing device, a feeding device, a rotary valve, a stirring device and a discharging box; the transmission device is arranged at the top end of the heat radiation fan; the transmission device is in clearance fit with the heat radiation fan; the conveying device is arranged on theright side of the transmission device; the transportation device is mutually meshed with the transmission device; automatic stirring is carried out, an operation staff does not need to do a manual stirring operation, so that a lot of time is reduced for operation staffs; therefore, the working efficiency is improved, and because mechanical stirring is carried out uniformly, granular medicines areavoided.