The invention discloses a mustard-flavored potato chip which is prepared from following raw materials in part by weight: 100 parts of mashed potato, 2 parts of mustard, 10 parts of green bean powder, 10 parts of glutinous rice flour, 2 parts of leaf mustard, 2 parts of cauliflower, 2 parts of Chinese cabbage, 1 part of champignon lyophiled powder, 1 part of black fungus lyophiled powder, 2 parts of purple perilla seed oil, 2 parts of pear juice, 2 parts of ginger, 0.2 part of lotus leaf, 0.2 part of rhodiola rosea, 1.0 part of baking soda, 2 parts of salt, 10 parts of white sugar, 0.5 part ofmonosodium glutamate, and appropriate amounts of water. The green bean powder, the leaf mustard, the cauliflower, the Chinese cabbage, the champignon lyophiled powder, the black fungus lyophiled powder, the purple perilla seed oil and the pear juice are rich in vitamins, meanwhile can improve the immune function of the human body, and are good for health, and the ginger, the lotus leaf and the rhodiola rosea can promote digestion, improve the immune function, depress blood-fat, and have health-care functions; and the mustard-flavored potato chip belongs to a delicious food.