Cold starting mechanism of diesel engine

The utility model relates to a cold starting mechanism of a diesel engine, which is added with a minor volume oil tank loaded with high-grade diesel oil and an oil delivery pipe on the basis of oil supply systems of an operating diesel oil tank, an operating diesel oil delivery pipe, an oil passage switch, and a jet pump of existing diesel engines. The operating diesel oil delivery pipe, the high-grade diesel oil delivery pipe, and the oil delivery pipe leading to the jet pump are connected by a three-way connection. The utility model can make combustible high-grade diesel oil used in cold starting conditions by alternatively turning the oil passage switch on and off. When a diesel engine reaches an operating temperature after starting, operating diesel oil is input by shifting the oil passage switch, and therefore, the utility model solves the problems of cold starting of cars in northern areas, avoiding trouble and accidents which result from using water scald and fire baking.