The utility model discloses a triaxial backing plate drilling machine, belong to circuit board processing equipment technical field, its technical essential includes the frame, and it has three drilling unit to distribute in the frame, is used for placing on the three drilling unit waiting to drill the up end of the platform of backing plate and being located same horizontal plane, the cooperation of three drilling unit is treated the processing backing plate and is drilld, one of them drilling unit is fixed in the frame, and another drilling unit is connected with the frame through horizontal side -to -side adjustment mechanism, a third drilling unit is connected with the frame through horizontal four -direction adjustment mechanism, the utility model aims at providing a convenient to use, respond well triaxial backing plate drilling machine, be used for driling to the backing plate.