Engine fuel preheater

The utility model relates to pretreatment for engine fuel, particularly an engine fuel oil preheater which is composed of an oil inlet pipe, an oil outlet pipe, an installing bracket, etc. Two end portions of a pipe type container are respectively provided with the oil inlet pipe, a water outlet pipe, the oil outlet pipe and a water inlet pipe, and the oil inlet pipe and the oil outlet pipe are communicated by a spiral pipe. The water inlet pipe and the water outlet pipe are communicated by the inner cavity of the pipe type container. Fuel oil is heated by utilizing heat generated by an engine. Therefore, the utility model has the advantages of simple structure, low cost and fuel oil saving, generates less harmful gas, and prolongs the service life of the engine. The utility model can be used in fuel oil engines.