The invention relates to a 4-benzoyl pyrazole compound with herbicidal activity. The structural formula of the 4-benzoyl pyrazole compound with the herbicidal activity is as shown in specifications, wherein R1 in the structural formula is selected from hydrogen, methyl or ethyl, R2 in the structural formula is selected from methylsulfonyl, methoxyl, methylthio, fluorine, chlorine or cyan, R3 in the structural formula is selected from hydrogen, methyl, methyl fluoride, difluoromethyl or trifluoromethyl, R in the structural formula is selected from a five-membered heteroaromatic ring, a six-membered heteroaromatic ring, C1-C6 alkoxyl, aromatic hetero-oxy, six-membered aryloxy or six-membered aromatic amino, and hydrogen in the C1-C6 alkoxyl can be replaced by fluorine or chlorine; m and n are selected from 0 or 1 and cannot be 1 at the same time. A series of relatively efficient weed killers and plant growth regulators with relative good selectivity and safety are synthesized by introducing a fluorine-containing functional group to a pyrazole 3-site and chemically modifying a pyrazole 5-site.