The invention provides an traffic cone automatic collecting and placing machine, belongs to the technical field of traffic management machines and tools, and aims to solve the problem that when existing traffic cone automatic collecting and placing equipment is used, the equipment cost is relatively high, management and maintenance are inconvenient, traffic cones are prone to fall down, and the placing effect is not ideal. The machine comprises a supporting frame main body, wherein a lifting mechanism is arranged at the upper part of the supporting frame main body, a motor is fixedly connectedto the left end surface of the supporting frame main body, a horizontal conveying device is fixedly connected to the bottom of the supporting frame main body, and an installing mechanism is hinged tothe left end surface of the supporting frame main body. The machine can fix the traffic cones, the situation that the traffic cones are thrown out due to inertia and the like in the driving process of an engineering vehicle is avoided, automatic fixing and loosening are achieved without control, the traffic cones are placed more smoothly and more steadily, the situation that the traffic cones fall down is greatly reduced, meanwhile, collecting and placing are achieved by using one device, the expenditure is saved, and the management and maintenance of the device are facilitated.