Thinner device (3) for thinning out vegetative elements protruding from branches of vegetable plants, in particular fruit trees. The thinner device (3) comprising: a body (4), extending substantially along a longitudinal axis (X), comprising an external structure (41)； and a plurality of remover elements (5), adapted to act upon vegetative elements for thinning them out； said remover elements (5) projecting from said body (4) at least along a direction perpendicular to said longitudinal axis (X).The thinner device (3) comprising a drive system (6), which in turn comprises: at least one first mechanism (65) at least adapted to cause at least said body (4) and said remover elements (5) to rotate in a controlled manner relative to said longitudinal axis (X)； at least one second mechanism (7) adapted to move said remover elements (5) relative to said external structure (41) of the body (4).
