The oil and gas double-cylinder thermoplastic preheater is improved on the basis of the gas-fired thermoplastic preheater. The equipment adopts a special oil and gas dual-purpose stove, which has fast melt speed and high efficiency, especially when using diesel as fuel. Convenient, no need to waste time for refueling; in the remote mountainous areas and plateau areas, the oxygen content in the air is low, diesel as fuel is obviously more advantageous than liquefied gas, reducing construction costs, as a new generation of thermoplastic preheater, is the construction team's first choice.