In the field of oil recovery engineering,aerospace engineering field and nuclear engineering field,there are some problems in the processing of deep hole parts,such as relatively single processing mode and low degree of automation.A new type of CNC deep hole drilling machine was designed,on which outside chip removal and internal chip removal could be achieved and reasonable chip removal system could be chosen according to the working conditions.The theoretical model of the new CNC machine tool was established,and the working principle of the machine tool was introduced.The finite element analysis for the loadbearing pillar of the machine tool was carried out,and the feasibility was verified by actual processing.It provides reference for deep hole processing.