The invention relates to the field of food and health-care products and provides a preparation method of salt containing compound components. The preparation method comprises steps as follows: a plant extract and a solvent are mixed and stirred, and a homogeneous dispersion body is prepared; the surface of sieved raw material salt is coated with the dispersion body by an fluidized-bed coating machine, and the salt containing the compound components is prepared; parameters of the fluidized-bed coating machine are set, the negative pressure in the machine ranges from 200 Pa to 500 Pa, the air inflow temperature ranges from 35 DEG C to 85 DEG C, the temperature of the raw material salt ranges from 30 DEG C to 70 DEG C, and the atomizing pressure of a spray gun ranges from 0.1 Mpa to 0.7 Mpa. The uniformity of the particle diameter and the uniformity of the content of plant extract are guaranteed through the fluidized-bed coating machine, besides, the defects of high adhesion performance and poor film forming performance of the plant extract are overcome due to addition of a lubricant and a plasticizer, and the problems of salt particle adhesion, exceeding of particle sizes and probability that salt particles easily fall and become fine powder in the dry storage process are avoided.