The present invention relates to a floating base cutter assembly (16) for use on sugar cane harvesters the assembly being formed by two base cutters wherein each of the base cutters (16) comprises a set of cutting knives (9) the base cutter assembly (16) comprising primary adjustment of the distance of the set of cutting knives (9) with respect to the ground the base cutter assembly (16) being mounted on the harvester body by means of a set of articulated rods (2 5) the base cutter assembly (16) comprising reading means for reading variation of the ground surface the reading means (7 8) being capable of generating an electric signal for variation of the distance of the set of cutting knives (9) with respect to the ground With this invention the base cutters (16) can accommodate ground unevenness rapidly enabling one to cut the sugar cane at an adequate height.
