A pneumatic leaf stripping system, in particular for stripping grape vine leaves, intended to be mounted on an agricultural machine such as a tractor, and comprising: - a casing provided with an arm intended to be mounted on the agricultural machine directly or via a frame, comprising fixed pneumatic leaf stripping means (8, 9) each provided with at least one circular opening formed by four openings (4 to 7), - a supply line capable of supplying compressed air to the stripping means (8, 9), and allow stripping by the stripping means (8, 9) by projecting compressed air by the stripping means through said opening (4, 7) provided in the casing, - adjustment means comprising a rotary connection and means for rotating the casing, - said arm having a main longitudinal axis and comprising the supply line and an attachment part for the arm for mounting on the agricultural machine directly or via a frame, - said supply line being guided along said attachment part for the arm and is connected to the stripping means (8, 9) through a connection in the casing via said rotary connection, - said means for rotating being configured to allow the casing to rotate about a first axis passing through said connection and substantially perpendicular to the main longitudinal axis of the arm, between at least two distinct angular positions with respect to said first axis, - said means for rotating comprise a longitudinal member extending between a first point of non-rigid attachment to the casing located at a non-zero distance from said axis passing through the connection, and at least one second point of attachment to the arm the second point of attachment being able to assume at least two distinct positions corresponding to the two distinct angular positions of the casing, and the connection at the first point of attachment allows at least rotation of the longitudinal member with respect to the casing about a second axis parallel to the first axis. - a casing provided with an arm intended to be mounted on the agricultural machine directly or via a frame, comprising fixed pneumatic leaf stripping means (8, 9) each provided with at least one circular opening formed by four openings (4 to 7), - a supply line capable of supplying compressed air to the stripping means (8, 9), and allow stripping by the stripping means (8, 9) by projecting compressed air by the stripping means through said opening (4, 7) provided in the casing, - adjustment means comprising a rotary connection and means for rotating the casing, - said arm having a main longitudinal axis and comprising the supply line and an attachment part for the arm for mounting on the agricultural machine directly or via a frame, - said supply line being guided along said attachment part for the arm and is connected to the stripping means (8, 9) through a connection in the casing via said rotary connection, - said means for rotating being configured to allow the casing to rotate about a first axis passing through said connection and substantially perpendicular to the main longitudinal axis of the arm, between at least two distinct angular positions with respect to said first axis, - said means for rotating comprise a longitudinal member extending between a first point of non-rigid attachment to the casing located at a non-zero distance from said axis passing through the connection, and at least one second point of attachment to the arm the second point of attachment being able to assume at least two distinct positions corresponding to the two distinct angular positions of the casing, and the connection at the first point of attachment allows at least rotation of the longitudinal member with respect to the casing about a second axis parallel to the first axis.