The invention discloses a concrete mixer capable of achieving fast and even mixing and relates to the technical field of industrial machinery. The concrete mixer comprises a mixer body ad a mixing bucket. The two sides of the inner wall of the mixer body are each connected with a sliding rail fixedly, and the two sides of the mixing bucket are each connected with a sliding block fixedly. The surfaces of the sliding blocks are slidably connected with the inner surfaces of the sliding rails, and a rotary device is fixedly connected with the top of the mixer body. A fixed box is fixedly connected with the bottom end of the rotary device, and a shaking device is fixedly connected in the fixed box. The surface of the shaking device is in transmission connection with a movable plate. Through the concrete mixer capable of achieving fast and even mixing, the problems that an existing concrete mixer cannot evenly mix concrete, and the mixing effect is poor are solved. Concrete is not liable to adhere to the edge, normal operation of the mixer is ensured, work efficiency of the mixer is improved, unnecessary trouble brought to people is avoided, and workload of the people is reduced.