NOVELTY - Deplugging coalbed methane well by secondary fracturing method comprises passing the fracturing fluid into tank truck by fracturing pump and then returning into the fracturing pump; injecting the fracturing fluid into the well; rapidly increasing the well bottom pressure, and when the bottom hole pressure exceeds the formation fracture pressure, stratigraphic cracks are formed; injecting sand into the cracks by fracturing pump, so that the cracks continue to extend forward and the fracturing sand spreads into the cracks; and continuously spurting.    USE - The method is useful for deplugging coalbed methane well by secondary fracturing method (claimed).    DETAILED DESCRIPTION - Deplugging coalbed methane well by secondary fracturing method comprises (a) passing the fracturing fluid into tank truck by fracturing pump and then returning into the fracturing pump, in order to check the fracturing pump work and pipeline connections; (b) closing the wellhead gate, holding the pressure in the high-pressure pipe manifold on the ground, regulating for 5 minutes, so as to test the pressure; (c) after passing the pressure test, injecting the fracturing fluid into the well via fracturing pump; rapidly increasing the well bottom pressure, and when the bottom hole pressure exceeds the formation fracture pressure, stratigraphic cracks are formed; (d) injecting sand into the cracks by fracturing pump, so that the cracks continue to extend forward and the fracturing sand spreads into the cracks; (e) opening the pressure gauge, so that the pressure drops to 90 minutes; and (f) if the pressure is not reduced to 0 MPa within 48 hours, continuously spurting, where the displacement is not more than 1 m3/hour. In step (a), step (c), and (d), the total amount of fracturing fluid used is 600-800 m3, and the fracturing fluid is obtained by mixing water and anti-swelling agent potassium chloride, where the potassium chloride concentration is 1%, and the injection method is light casing injecting. In step (iii) and (iv), the fracturing pump displacement is 6-8 m3/minute, the quartz sand adding amount is 40-60 m3, the particle size is 0.85-1.15 mm, and sand is 10 m3 of 20%, and the sand particle size is 0.425-0.85 mm for 80%.