The invention relates to novel substituted iminoalkoxy-phenyluracils of the general formula (I) in which R1 is hydrogen, amino or optionally substituted alkyl, R2 is carboxyl, cyano, carbamoyl, thiocarbamoyl or alkyl or alkoxycarbonyl, the latter two being optionally substituted, R3 is hydrogen, halogen or optionally substituted alkyl, R4 is hydrogen, cyano, thiocarbamoyl or halogen, R5 is cyano, thiocarbamoyl or halogen, R6 is hydrogen or optionally substituted alkyl, R7 is optionally substituted alkyl, and R8 is hydroxyl, amino or a radical of the series alkyl, alkoxy, alkylamino, dialkylamino, alkylcarbonylamino, alkoxycarbonylamino, alkylsulfonylamino, alkenyl, alkynyl, alkenyloxy, alkynyloxy, aryl, aryloxy, arylamino, arylcarbonylamino, arylsufonylamino, arylalkyl, arylalkylamino, arylalkylcarbonylamino or arylalkylsulfonylamino, each of which is optionally substituted. The invention further relates to methods for producing said compounds and their use as herbicides.