The concrete mixer comprises a power mechanism connected with the transmission mechanism through a shaft and a drum driven by the transmission mechanism, a gear ring arranged around the drum barrel is installed on the drum barrel, and a gear meshing with the gear ring is arranged on the transmission shaft. The structure of the utility model is simple and reasonable. After the gear and gear ring are meshed, the sliding phenomenon between the supporting wheel and the mixer drum in rainy and foggy weather can be effectively overcome; The transmission mechanism can further ensure the elimination of slip between the supporting wheel and the mixer drum Model: 120L,160L,200L,240L,280L,350L,400L,500L. just tell me your needs, and contact us.