The invention discloses a mixed weedicide containing flazasulfuron, dithiopyr and pyributicarb. The mixed weedicide adopts flazasulfuron, dithiopyr and pyributicarb as main effective components, wherein the mass ratio of flazasulfuron to dithiopyr to pyributicarb is (0.1-80) to (0.1-80) to (0.1-80). The mixed weedicide can be applied to weeding in front of and behind lawn seedlings, particularly to prevention and removal of various grassy, cyperaceous and broad-leaved weeds in the lawn, and has a remarkable effect; in addition, the mixed weedicide has a relatively good synergetic effect, can delay the resistance of the weeds, and is wide in weeding spectrum, long in lasting time, safe to the lawn and remarkably superior to a single weedicide in effect.