The present invention provides an additional type numerically controlled lathe intelligent coding control system, which comprises a numerical control system, monitoring video heads, a three-dimensional image modeling device, an instruction corrector, a code parser, a center console, a man-machine interaction interface and a database. The numerical control system, the instruction corrector, the code parser, the center console and the man-machine interaction interface are sequentially connected in series. The center console is also connected with the three-dimensional image modeling device. The three-dimensional image modeling device is connected with the plurality of monitoring video heads. The plurality of monitoring video heads are mounted at different locations on a numerically controlled lathe and are aligned with the working stations of the numerically controlled lathe. According to the invention, the setting of the numerically controlled lathe in the prior art is not changed at all based on the above additional configuration, so that the effects of high enterprise acceptance degree and extremely good market prospect are realized. Meanwhile, by means of the three-dimensional image modeling device and the center console, not only the manual coding of users is enabled, but also the automatic coding of the system is also enabled. Therefore, a solid foundation is provided for full automation. In addition, the convenient use of the system is not influenced at all in immature automatic conditions.