Closure device for waste collection bins, comprising: a support structure rigidly engageable with the top of a containment tank; a covering assembly operatively borne by the support structure to close the containment tank at the top, wherein the covering assembly comprises: at least one covering element having a proximal portion rotatably coupled to the support structure and a distal portion movable about a pivoting axis of the proximal portion; at least one access door rotatably coupled to the distal portion of the covering element, wherein the covering element is configured for moving, from a waste collection condition to a waste emptying condition, between a rest condition in which the distal portion rests on the support structure and an open condition in which the distal portion is spaced from the support structure, characterized in that the covering element is configured for moving from the rest condition to the open condition in consequence of a tilting of the closure device about a horizontal tilting axis (X 1), and in that the access door is rotatable about a joint axis parallel to the pivoting axis, wherein said covering element and access door have the respective pivoting axis and joint axis extending parallel to the horizontal tilting axis (X 1), the closure device further comprising selective engagement devices configured for switching in consequence of the tilting of the closure device without interfering with the access door, between a locked condition in which they hold the covering element in the rest condition when the covering device is in said waste collection condition, and a released condition in which the covering element is able to move. a support structure rigidly engageable with the top of a containment tank; a covering assembly operatively borne by the support structure to close the containment tank at the top, wherein the covering assembly comprises: at least one covering element having a proximal portion rotatably coupled to the support structure and a distal portion movable about a pivoting axis of the proximal portion; at least one access door rotatably coupled to the distal portion of the covering element, wherein the covering element is configured for moving, from a waste collection condition to a waste emptying condition, between a rest condition in which the distal portion rests on the support structure and an open condition in which the distal portion is spaced from the support structure, characterized in that the covering element is configured for moving from the rest condition to the open condition in consequence of a tilting of the closure device about a horizontal tilting axis (X 1), and in that the access door is rotatable about a joint axis parallel to the pivoting axis, wherein said covering element and access door have the respective pivoting axis and joint axis extending parallel to the horizontal tilting axis (X 1), the closure device further comprising selective engagement devices configured for switching in consequence of the tilting of the closure device without interfering with the access door, between a locked condition in which they hold the covering element in the rest condition when the covering device is in said waste collection condition, and a released condition in which the covering element is able to move. at least one covering element having a proximal portion rotatably coupled to the support structure and a distal portion movable about a pivoting axis of the proximal portion; at least one access door rotatably coupled to the distal portion of the covering element, wherein the covering element is configured for moving, from a waste collection condition to a waste emptying condition, between a rest condition in which the distal portion rests on the support structure and an open condition in which the distal portion is spaced from the support structure, characterized in that the covering element is configured for moving from the rest condition to the open condition in consequence of a tilting of the closure device about a horizontal tilting axis (X 1), and in that the access door is rotatable about a joint axis parallel to the pivoting axis, wherein said covering element and access door have the respective pivoting axis and joint axis extending parallel to the horizontal tilting axis (X 1), the closure device further comprising selective engagement devices configured for switching in consequence of the tilting of the closure device without interfering with the access door, between a locked condition in which they hold the covering element in the rest condition when the covering device is in said waste collection condition, and a released condition in which the covering element is able to move.