The invention discloses a full-width-type sprinkling irrigation system for a greenhouse. The full-width-type sprinkling irrigation system comprises a sprinkling irrigation robot and a robot running track hoisted in the greenhouse, wherein a supply depot is also hoisted at one end of the robot running track and is provided with a liquid replenishing pipe for providing water or liquid fertilizer; the sprinkling irrigation robot comprises a rack; a spraying mechanism, a traveling mechanism and a controller are respectively arranged on the rack; the spraying mechanism comprises a spraying head, a liquid storage tank and a spraying pump; the liquid storage box is provided with a supply opening socked with the liquid replenishing pipe during replenishment; the spraying head is used for pumping liquid in the liquid storage tank through the spraying pump and providing spraying liquid; the traveling mechanism comprises a pair of travelling rollers arranged at the top of the rack and a driving assembly for driving the travelling rollers to travel; the rack is suspended on the robot running track through the travelling rollers. The full-width-type sprinkling irrigation system for the greenhouse, disclosed by the invention, is provided with the supply depot and can supply charging and the spraying liquid; in addition, the supply operation is realized simply and conveniently.