There is provided a waste discharge valve for a vacuum-conveyance waste collection system in which waste put in a waste receiving device is automatically conveyed to a central waste collection station through a conveying line.In the vacuum-conveyance waste collection system in which a housing includes an upper end on which a waste receiving opening is formed and a lower end which is connected to a conveying line connected to a central waste collection station, and a chute is installed in the housing, temporality stores waste and guides the waste to the conveying line, the waste discharge valve is installed at a lower end of the chute and comprises: an air cylinder; a first link plate connected to one end of a cylinder rod of the air cylinder; a damper arm for opening/closing the waste discharge valve by pivot; and a second link plate pivotally connected to the first link plate and the damper arm so that the opening/closing of the waste discharge valve is controlled, and wherein the chute includes an airline with an upper air inlet, a middle air outlet and a lower air outlet.