The invention discloses a gas extraction method for a fully mechanized caving working face of soft surrounding rock. The gas extraction method comprises the following steps that S1, before coal seam mining, a roadway is developed in a hard rock stratum of a coal seam roof, and a temporary support is strengthened; S2, drilling is conducted towards a coal seam in a working face service roadway, andinitial gas drainage is conducted; S3, during drilling, a self-drilling drilling pipe of a hollow structure is adopted, small holes are formed in the section, entering the coal seam, of the self-drilling drilling pipe, and the self-drilling drilling pipe is left in a drilled hole of the coal seam after drilling into the coal seam; S4, a test probe and the self-drilling drilling pipe are connected;S5, a supplying operation table and the drilling pipe are connected through a hose, a flexible sealing medium with the set pressure is provided into the test probe; S6, pressure testing is conductedto inspect the hole sealing effect; and S7, the test probe is connected with a measuring system, and gas pressure representation numerical values are read after a gas pressure gauge in the measuring system is stable. According to the gas extraction method, drainage is conducted in the high-level roadway, the characteristic of upward flowing of gas is met, thus drainage is facilitated, and the drainage effect is good.