The direct heating portable equipment in the horizontal energy-saving asphalt tank not only has fast heating speed, saves fuel, but also does not pollute the environment, and is easy to operate. The heating and preheating of asphalt have been achieved, and the production of high-temperature asphalt and the supplementation of asphalt preheating asphalt are carried out in an equal, synchronous, and automatic manner in a closed state. Greatly shortening the heating time, saving energy, shortening the aging of asphalt, reducing operating procedures, and lowering equipment investment and asphalt production costs.