In order to speed up the product development cycle of the rebar rolling machine, improve the intelligence of manufacturing technology, and allow designers to predict machine problems in advance and reduce development costs, a virtual debugging system of rebar rolling machine based on NX MCD was proposed. NX MCD+S7-PLCSIM Advanced V20 SP1+TIA Portal V151 automated virtual debugging platform was built, the 3D virtual machine electrical modeling of the wire roller was studied, the virtual PLC was established to achieve signal processing and communication, the HMI and LAD control program were designed, the processing data was monitored in real time by using Portal, and the detailed equipment operation parameters were obtained through the virtual simulation debugging of the examples, and the accuracy of the method was verified.