The invention discloses and provides a coal tar oil mixing device. The coal tar oil mixing device comprises a tar distilling device, an asphalt cooling device, a heavy oil groove, a first oil distributing groove, a second oil distributing groove, a vertical low-resistance cooling system, a circulating cooling device, a finished product oil groove and a washing tower. Therefore, green tobacco through cooling enters the washing tower again for washing, so that the environmental pollution is reduced. Moreover, through addition of a first stirrer, a second stirrer, a first temperature sensing device and a second temperature sensing device, a complete set of system can realize continuously automatic operation, the mixing efficiency is further improved, and the product quality is guaranteed.