The invention relates to a method for depression-angle negative-pressure exploration and discharge of accumulated water in a goaf area of a mine. The method can solve the technical problems of poor safe controllability and the presence of safety risk of conventional exploration and discharge of the accumulated water in the goaf area. The method includes the following steps that S100, the working condition is surveyed and measured; S200, the accumulated water amount in the goaf area is estimated; S300, a plan for exploration and discharge of the water is made; S400, drainage boreholes are constructed; and S500, a pumping scheme is selected to pump the water. According to the method for depression-angle negative-pressure exploration and discharge of the accumulated water in the goaf area ofthe mine, depression-angle drilling is conducted in advance in the roadway, the accumulated water in the surrounding goaf area below the roadway is explored and discharged in advance, the roadway is located on the upper part of a water body in the goaf area, thus the water exploration and discharge process is absolutely safe, the water discharge work can be conducted in advance, the impact on roadway driving is reduced, the water discharge process does not rely entirely on water pressure differential artesian flow, but the water is pumped in the negative-pressure state through an air pressingdevice, and thus the safe reliability and controllability of the water exploration and discharge process is higher.