The invention discloses a method for testing a descaling performance of a surfactant and chelating agent ternary compound descaling agent. The method comprises the following steps: (a) selecting experiment containers, and cleaning and drying for later use; (b) respectively dripping OP-10, EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt and DTPA (Diethylenetriamine Pentaacetic Acid) into the experiment containers according to a ratio, wherein the weight of the EDTA disodium salt accounts for 20-30wt% of the total weight, the weight of the DTPA accounts for 10-40% of the total weight, and the balance being the OP-10; (c) adding distilled water, shaking up, dissolving, and regulating the pH value; (d) putting the experiment containers in a water bath, adding barium sulfate scale, reacting for a period of time, performing suction filtration after the reaction is ended, drying, weighing, and recording reaction phenomena and data; and (e) analyzing the data and reaction phenomena, so as to obtain the descaling performance of the surfactant. According to the method, the descaling performance of the surfactant and chelating agent ternary compound descaling agent can be rapidly tested, the result is accurate, the test time is short, the test cost is reduced, and a theoretical basis is provided for scale removal by applying the descaling agent.