The invention discloses preserved-date-taste pickled radishes with chili oil and a preparation method thereof. The preserved-date-taste pickled radishes are prepared from, by weight, 6-7 parts of soybean cake powder, 1-2 parts of desmodium triquetrum, 3-4 parts of cabbage juice, 7-8 parts of preserved dates, 20-25 parts of pumpkin seed oil, 1-2 parts of pumpkin flowers, 1-2 parts of chayotes, 15-17 parts of pod peppers, 1-2 parts of shredded gingers, 1-2 parts of white vinegar, 2-3 parts of mashed garlic, 110-120 parts of fresh radishes, proper salt, calcium chloride, liquid vitamin C, tea water, sodium diacetate, nipagin complex esters, pectin methylesterase and water. The desmodium triquetrum is soaked in the cabbage juice, the soybean cake powder and the desmodium triquetrum solution are mixed and smashed into the preserved dates, and then steaming is carried out prior to drying and grinding into powder. Due to faint scent of desmodium triquetrum and aromatic flavor of the preserved dates, the pickled radishes with chili oil have a sweet smell and great taste; content of calcium pectate can be increased to improve crispiness of the dishes, flavochrome is reduced by means of blanching so as to well keep radish quality, and the prepared pickled radishes with chili oil are properly crispy, attractive and appetizing.