The self-cleaning enclosed belt conveyor for loose materials comprises a mobile belt (10) operatively connected to proper containment walls (2), where mechanical means (1, 15) are provided for, connected to said conveyor belt (10), wherein said mechanical means perform together with a bottom (8) of said containment walls (2) a recovery operation of the loose materials present in the area between the belt (10), the bottom (8) and said containment walls (2), bringing the materials back either to belt's upper stretch or to adequate containment systems.