The invention discloses an electronic driving and electronic control type composite improved grassland root-cutting, fertilizing and reseeding machine, belongs to the technical field of agriculture machinery, and in particular relates to an improved multifunctional grass machine capable of selecting different composite improvement modes (root cutting, root cutting and reseeding, and root cutting, fertilizing and reseeding) according to the degradation degrees of a grassland (slight degree, medium degree and severe degree). The machine particularly comprises a frame, an electronic-controlled seeding and fertilizing device, a root-cutting and ground-breaking part, an earthing and ditching device, a transmission system, a depth limiting wheel, a V-shaped press wheel, a seed tank and a fertilizer tank. According to the machine, a layered alternating type ditching and earthing principle is adopted, the problem of ditching a high-hardness grassland is solved with the lowest soil disturbance rate, minimum ditching power consumption and most stable ditching effect and earthing effect; by virtue of the armature electronic-controlled seeding and fertilizing device, the influence of uneven grasslands to the displacement uniformity can be reduced, the displacement control accuracy is effectively improved, and the automatic level and the accurate control level of the whole machine can be improved.