Herbicidal composition as well as preparation and application thereof

The invention relates to the technical field of pesticides and in particular relates to a herbicidal composition as well as a preparation and application thereof. The herbicidal composition comprises bentazone sodium salt and fomesafen sodium salt. The herbicidal composition has the beneficial effects that the ratio of bentazone sodium salt to fomesafen sodium salt is (1 to 95)-(95 to 1), and the co-toxicity coefficient is more than 120, so that the herbicidal composition has synergistic effects; field experiment results show that the comprehensive control effect of the herbicidal preparation of bentazone sodium salt and fomesafen sodium salt on broadleaf weeds is over 96% 30 days after the herbicidal preparation is applied and is obviously better than the control effects of single bentazone and single fomesafen, thereby indicating that the herbicide has synergistic control effects, can conduce to reducing the dose and the cost and is environment-friendly.