Concrete mixer and discharging device thereof

The utility model provides a concrete mixer and a discharging device thereof. The discharging device comprises a first driving device, a first rack, a first gear and a discharging gate, wherein the first driving device can be mounted on a mixing drum of the concrete mixer and drives the first rack to vertically slide, the first rack is meshed with the first gear, the first gear is connected with a first rotating shaft mounted on a first bearing, the first bearing is fixedly arranged on the mixing drum, and the discharging gate for closing a discharging port on the mixing drum is arranged on the first rotating shaft. The force couple of the driving device is used for driving, rotating torque is ensured to maximum when the discharging gate is opened and closed, opening and closing of the discharging gate are benefited, and the service lives of components can be prolonged.