The invention relates to biological liquid for preventing seasonal febrile diseases in ginger growth and a preparation process thereof. The biological liquid is characterized by comprising the following components in part by weight: 10 to 30 parts of light rare earth, 30 to 55 parts of amino acid, 2 to 5 parts of soil bactericide, 2 to 5 parts of soil disinfectant, 5 to 15 parts of seasonal febrile disease resisting agent, 0.5 to 2 parts of boric acid, 1.5 to 3 parts of zinc sulfate, 0.5 to 2 parts of sodium benzoate and 10 to 20 parts of water. The preparation process comprises the followingsteps of: 1) detection of raw materials; 2) fixed dissolution; 3) rare earth soaking; 4) auxiliary material soaking; 5) mixing; 6) blanking; 7) stirring; and 8) storage, detection and packing. The prepared biological liquid can effectively prevent the seasonal febrile diseases in the ginger growth; the rare earth is used as a main component so as to reduce the secondary pollution of chemical substances to the environment and facilitate environmental protection; and the preparation process is simple.