The utility model provides an energy -conserving sunlight greenhouse underground heat accumulation drip irrigation system, it is including setting up in the moisturizing case and the solar heat collection device at greenhouse top to and by shallow to driping irrigation tub of deeply arranging in proper order, cooling tube and heat accumulation pipe under the ground in the greenhouse, the heat accumulation pipe is via forming the circulation water route between circulating line and moisturizing case and solar heat collection device to having concatenated the circulating pump on circulation pipeline connects in parallel on the circulating line in the both ends of cooling tube, has concatenated the valve between heat accumulation pipe and cooling tube and circulating line respectively, drip irrigation tub to be close to and arrange in the cooling tube to have the pressurized -water source to link to each other with the outside, still parallelly connected meeting there be a plurality of stretching out in the subaerial burette that oozes on driping irrigation the pipe. The utility model discloses an energy -conserving sunlight greenhouse underground heat accumulation drip irrigation system can improve soil and greenhouse temperature, also can realize warm -water irrigation, and can have better result of use.