Compounded weed control composition

The invention relates to a compounded weed control composition comprising a first active component-spirodiclofen diester and a second active component-pyridaben and in particular relates to a pest-killing method. The compounded weed control composition for the paddy field comprises a first active component-penoxsulam and a second active component-2-methyl-4-chloro-phenoxyacetic acid isooctyl ester, of which the ratio range in weight percentage is 1:2 to 1:16. The compounded weed control composition has good fast-acting property and good lasting effect and has the synergistic interaction on the pest-killing effect, the production cost and the agricultural cost can be reduced and the compounded weed control composition can well serve for agriculture production.