The invention overcomes defects in prior art, and provides a quick and accurate machining technique for ensuring machining of hole coaxiality in a servo valve body. For settling a technical problem, the machining technique for ensuring hole coaxiality in the servo valve body is characterized in that one-time point alignment is utilized for establishing an A-hole coordinate system; the A-hole coordinate system is utilized for performing mathematical calculation for deriving a B-hole machining coordinate system; a deriving calculation process is implanted into a numerical control program; coordinate calling, coordinate calculation and coordinate storage are performed for generating a new coordinate system, namely the coordinate of the B-hole; and finally the two coordinate systems are utilized for machining corresponding holes, thereby ensuring coaxiality qualification of the hole. The machining technique can be widely applied in the field of numerical control machining.