The present invention relates to a compound thickening agent comprising rhamsan gum and gellan gum. In the compound thickening agent, rhamsan gum accounts for 50 percent -95 percent of the total weight of rhamsan gum and gellan gum. The combination of rhamsan gum and gellan gum in the compound thickening agent produces a synergistic effect, and the viscosification properties are remarkably improved. The compound thickening agent can be applied to products such as foods, beverages, drugs, and personal care products, and when the compound thickening agent is applied as a gelling agent to a film of a soft capsule, the film strength and the film elasticity are better.

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