The present invention relates to a protection system for a sports ground comprising a frame-chest with a protection cover, said frame-chest being able to move across the entire length of the ground whilst unfolding or folding said protection cover by means of an unfolding and folding mechanism, in which said frame-chest is connected to a network of cables spread out in advance over the sports ground, said cables being operated by motorized pulleys in order to ensure the motion of said frame-chest over said sports ground.