The invention discloses a precision ultra-precision 
machining method for forming 
grinding. Through the method, the precision progressive type 
grinding machining technology mode, including in-place shape correcting, in-place trimming, online electrolytic 
sharpening and online detection, of a 
metal-bonded 
grinding wheel is achieved. The method is characterized in that 
graphite wheel precision turning forming is achieved in place; deionized water serves as a medium, and 
grinding wheel electric spark precision forming and shape correcting are achieved; through 
a diamond roller opposite-grinding trimming method, in-place trimming of the 
grinding wheel is achieved, and a hard layer is removed; online electrolytic 
sharpening is conducted, and it is achieved that the good sharpness of the 
grinding wheel is kept all the time in the grinding and removing processes; online detection is conducted, and 
dimensional precision detection of a machined part is achieved; and according to the grinding wheel particle size, the concentration and progressive magnitude between different procedures, precision progressive type precision forming grinding 
machining is achieved. Through the precision ultra-precision machining method, the problems that a traditional machining mode is poor in offline shape correcting, trimming, 
sharpening, detection and 
machined surface quality, and the machining quality consistency is difficult to ensure are solved, and precision ultra-precision forming grinding machining can be achieved under the 
batch production conduction.