The invention discloses a weeding composition and a preparation method thereof. The weeding composition comprises the following components in percentage by weight: 10-30% of
propanil, 0.6-6% of fenquantel, 0.2-2% of cyclopropanesulfonamide, 2-6% of a stabilizer, 3-8% of a dispersing agent, 3-5% of an anti-freezing agent, 0.1-0.3% of a defoaming agent, 0.1-1% of a
thickening agent and the balance of water. Wherein the ratio of
propanil to fenquantel to the stabilizer is 5: (0.1-1): 1. The weeding composition provided by the invention can effectively prevent and remove
annual weeds in paddy fields, is safe to paddy rice and high in preparation stability, has very high market value, and solves the problems of poor safety, environmental harm and the like in the process of preventing and removing
annual weeds in paddy fields by using the existing medicament.