The invention relates to a child-proof capsule with a security strip (12) the capsule comprises an internal cap (4) which can be removably applied on a neck (2) of a container (1). An external cap (5) is applied and constrained on the internal cap (4). The external cap (5) is free to move in an axial direction from a first position in which free rotation is possible between the external cap (5) and the internal cap (4) to second position in which the external cap (5) and the internal cap (4) are solid in rotation. The security strip (12) is made in a single piece with the internal cap (4) and is of annular shape with a V-section. When the capsule is mounted on the container, a free circumference (12b) of the security strip (12) engages with an annular projection (15) fashioned on the container (1). In a connection zone between the security strip (12) and the peripheral edge (4a) of the internal cap (4) there is a plurality of circumferential cuts (16), not conjoined, which occupy all of the connection zone.
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