The invention relates to a cordyceps militaris tea bag and a preparation method thereof, and belongs to the field of tea bags. Cordyceps militaris, licorice roots, Chinese wolfberry fruits, chrysanthemums, lemons, dried lily bulbs, wild jujubes, pears, dandelions, lotus leaves, mint, honeysuckle flowers, dried orange peel, haws and fructus momordicae are adopted. The preparation method comprises the following steps of performing superspeed freeze-drying by a freeze-drying technique for 1-3 seconds, and performing direct proportioning, so that people can drink the brewed cordyceps militaris tea bag; or loading dry ultrafine powder in an earthen jar, performing uniform stirring with loess at places where the cordyceps militaris grows until a paste is obtained, sealing the opening of the jar, performing natural fermentation and alcoholization, placing the treated earthen jar in natural ventilation environment, absorbing the essence of the sun and the moon in the universe, after one year, performing microwave sterilization, performing simultaneous drying, removing dampness, performing filtering, and performing loading into bags, so that the tea bag can be drunk. People drink the tea, so that the effects of preventing people from suffering from diseases and benefitting vigour are achieved, various diseases caused by chronic fatigue syndromes are relieved, and the efficacy of delaying ageing, prolonging life can be achieved.