The invention discloses a telescopic drop irrigation device used in a herding meadow. The telescopic drop irrigation device comprises a telescopic drop irrigation device body, a delivery pipeline, a control box and a pressure sensor, wherein the telescopic drop irrigation device body is buried in an irrigation soil layer, the delivery pipeline is supported on a surface layer of the irrigation soillayer, the control box is installed outside the irrigation soil layer, the pressure sensor is installed on a left-side tail end wall of the delivery pipeline, the detection end of the pressure sensorextends into the delivery pipeline, a telescopic drop irrigation pipe of the telescopic drop irrigation device body is communicated with a water inlet branch pipe and a water inlet main pipe of the delivery pipeline, a telescopic sleeve of the telescopic drop irrigation device body is communicated with the inside of the delivery pipeline, and the control box comprises a water pump, a hydraulic oil pump, a water storage tank, an overhaul door, a water injection pipe and a control panel. The telescoping length of the telescopic drop irrigation device can be adjusted by changing oil pressure ofan oil way, and accordingly irrigation of the irrigation soil layer at different depths is achieved.