The invention belongs to the field of herbicides and in particular relates to an herbicide and application thereof. A weeding preparation comprises at least one carrier and at least one aid, the preparation has herbicide dosage forms of a water emulsion, a dispersible oil suspending agent, a dispersible oil agent, a micro emulsion, cream, a soluble liquid agent, an aqueous agent, a suspending agent, a suspension emulsion, an ultra-low capacity agent, powder, wettable powder, granules, dry water dispersible granules, a dry suspending agent, a microcapsule suspending agent, emulsion powder, effervescent granules, an effervescent tablet agent and a water dispersible tablet with the compound of the formula I as an active component. By adopting varieties of the preparation provided by the invention, weeds such as barnyard grass, green bristlegrass, sedges, water sedge, digitaria, hispid arthraxon, abutilon, zinnia elegans, amaranthus retroflexus, purslane, xanthium sibiricum, cassia tora, wild watermelon seedlings and wild soybean seedlings can be effectively controlled, a very good weeding effect can be achieved with a low dosage, and the preparation has good security for crops such ascorn, wheat and rice and can be used as a herbicide in agriculture.