The invention discloses a deep blind hole machining method. The deep blind hole machining method comprises the following steps that S1, tool selection is carried out, wherein a center passing tool rodand a common shockproof tool rod are selected as machining tools, the center passing tool rod can be used for center passing machining, and the diameter of an outer circle of the tool rod is larger than half of the hole diameter of a hole to be machined; S2, perforating is carried out, wherein perforating is carried out on a machined piece by using a drill bit, then rough boring is carried out onthe hole, the machining allowance of 3 mm is reserved for the bottom of the hole, and a finish turning allowance of 0.1 mm is reserved for the hole diameter; S3, hole bottom machining is carried out,wherein the two tools are used for machining the hole bottom three times in an alternated mode, each time when machine is carried out, firstly, the center passing tool rod is used for performing machining from the maximum range capable of being machined to the center of the hole, then the common shockproof tool rod is used for machining the rest part to the hole diameter, the depth of the total depth is 1 mm every time when machining is carried out until the depth requirement of the hole is met, and the finish turning allowance of 0.06 mm is reserved; and S4, finish machining is carried out,wherein finish machining is carried out on an inner hole and the hole bottom in sequence so as to finish deep blind hole machining. The deep blind hole machining method solves the problem that a toolis prone to vibration when the hole bottom of the deep blind hole is machined.