The invention discloses a smokeless vehicle diesel oil, which comprises the following components in parts by weight: 180 to 220 parts of aviation kerosene, 90 to 110 parts of plant oil, 245 to 265 parts of finely-processed drainage oil, 290 to 310 parts of self-made smokeless oil, 45 to 55 parts of anti-freezing and pour point reducing agent, 8 to 12 parts of upgrading agent, and 30 to 40 parts of flame retardant. The finely-processed drainage oil is prepared by the following steps: heating drainage oil, removing impurities from drainage oil, carrying out primary filtration by a filter screen, and carrying out secondary filtration through pressurization. The smokeless vehicle diesel oil is prepared by the following steps: mixing smoke oil and edible vinegar according to a weight ratio of 1000:10-15, stirring for 40 to 50 minutes at a temperature of 11 to 12 DEG C in a rotation speed of 60 to 120 r / min, allowing the system to stand still, when the precipitate has a dark-red color and the supernatant oil has a white-green color so as to obtain the self-made smokeless oil (supernatant oil); mixing kerosene, plant oil, and finely-processed drainage oil, stirring until specific gravity reaches 0.85, transferring the mixture to another container, adding self-make smokeless oil, an anti-freezing and pour point reducing agent, an upgrading agent, and a flame retardant, stirring until the specific gravity of the mixture reaches 0.85, stopping stirring, and completely transferring the mixture to an oil storage tank so as to obtain the smokeless vehicle diesel oil. The raw material costs of the smokeless vehicle diesel oil are reduced, moreover, the diesel oil is smokeless and environment-friendly, and the quality of the diesel oil meets the standards of DB11 / 239-2010.