Abstract: A combined through-hole processing machine includes a working bed provided with two opposite and parallel slide rails on it. A deep-hole processing mechanism is provided on the working bed and includes a pair of sub-spindle heads used to clamp a deep-hole tool respectively to conduct the deep-hole processing on workpiece. A U axis feed unit is provided between the two slide rails and used to provide the feed for the movement in the long axis direction parallel to the two slide rails. A deburring mechanism is provided on the working bed and located at one end side of the deep-hole processing mechanism, which includes the corresponding two chucks and two tailstocks where the chucks are used to clamp the workpiece with the deep-hole processing already fulfilled on the deep-hole processing mechanism respectively and the tailstocks are provided to arrange the deburring tools respectively to conduct the deep-hole deburring action.