Effervescent tablet herbicide

The invention discloses an effervescent tablet herbicide and relates to the technical field of preparation of herbicides. The effective components and the main proportion are shown as follows: the total mass percentage of cyhalofop-butyl, pyrazosulfuron and mefenacet in the effervescent tablet herbicide is 40-80 percent; the effervescent tablet herbicide further comprises the following componentsin percentage by weight: 5-10 percent of disintegrating agent, 1-10 percent of dispersing agent, 0.5-5 percent of wetting agent, 0.1-5 percent of bonding agent, 0.1-2 percent of flow adjuvant and thebalance of a filler, the sum of the mass percentage of all the components is 100 percent. The invention provides the mixed herbicide with the advantages of being wide in weeding spectrum, good in weeding effect, quick in effect, long in lasting period, delayed in herbicide resistance, thorough in weeding, low in residue and low in toxicity; the mixed herbicide is high in herbicide efficacy and quick in control effect and s