The invention discloses a traffic cone placing device and relates to the field of road traffic equipment. According to the technical scheme, the traffic cone placing device comprises a truck body and a truck bucket arranged on the rear portion of the truck body; a traffic cone placing unit is arranged on the rear side of the truck bucket and comprises a bottom platform and a traffic cone placing mechanism; the bottom platform is connected with the rear portion of the truck body through a rail; a telescopic pushing rod is arranged on the bottom platform; and one end of the telescopic pushing rod is fixedly connected with the bottom platform, and the other end of the telescopic pushing rod is fixedly connected with the lower surface of the traffic cone placing mechanism. A solar charging panel is arranged on the upper surface of a shell of the traffic cone placing mechanism, and the solar charging panel supplies power to the traffic cone placing mechanism through a storage battery. The traffic cone placing device has the beneficial effects that the traffic cone structure used in the traffic cone placing device is basically similar to the structure of an existing traffic cone, simple and easy to manufacture, the traffic cone placing unit and a truck are assembled together through a truck-mounted type structure, and in placing, traffic cones can be automatically placed in the advancing process of the truck only by additionally placing stacked traffic sets into the traffic cone placing device by people.