The invention relates to the field of drilling machines, in particular to a multifunctional numerical control drilling machine capable of changing tools automatically. The multifunctional numerical control drilling machine can change the tools automatically, improve the machining efficiency and lower the frequency of clamping in product machining, and comprises a machine frame, a working platform and a drilling machine head. The working platform is arranged on the machine frame through a sliding device. A power device is longitudinally arranged between the working platform and the machine frame. Stand columns are arranged on the portions, on the two sides of the working platform, of the machine frame respectively, and transverse sliding rails are arranged at the top ends of the two stand columns and connected with the drilling machine head in a sliding mode. A power device is transversely arranged between the two stand columns and connected with the drilling machine head. A tool rest is arranged at one end of the working platform and provided with four tool containing grooves, tool aprons are arranged in the tool containing grooves, and the tools are fixed into the tool aprons. According to the multifunctional numerical control drilling machine, the drilling machine head can change the tools automatically under the control of programs, different machining procedures can be completed by clamping a product just one time, and therefore the machining efficiency and the machining precision of the product are improved.