The invention relates to an automatic traffic cone putting device, which belongs to the field of traffic machinery, and comprises a cone putting device, a suspension device, a guiding device and a supporting device, wherein the suspension device and the guiding device are arranged at the two ends of the cone putting device, and the supporting device is arranged at the bottom of the cone putting device. Compared with the prior art, the automatic traffic cone putting device provided by the invention has a novel structure and a reasonable design, is simple and convenient to install and maintain, is easy to operate, is flexible to move, and is convenient to regulate and control, a large number of labor can be saved, the speed for putting traffic cones can be obviously improved, the safety of workers can be effectively guaranteed, simultaneously, the putting effect is ensured, stable and accurate putting of the traffic cones can be realized, the consistency in putting intervals of the traffic cones is ensured, the putting intervals can be regulated according to the need, an operator can know running conditions of devices constantly through a monitoring system, the construction safety is fully ensured, and the automatic traffic cone putting device is suitable to be promoted and applied in traffic-related engineer operation requiring putting the traffic cones and similar facilities.