The invention provides a software control method for an I-bar welding robot. The software control method for the I-bar welding robot aims to solve the problems that an existing I-bar welding machine is low in automation degree, coating welding operation is inconvenient, and the work efficiency is low. According to the software control method for the I-bar welding robot, a system is programmed with the c programming language. The software control method for the I-bar welding robot is characterized by introducing and exporting of the closed-loop control PID algorithm and the welding parameter formula which is commonly used and the configuration state of a human-computer interface. According to the software control method for the I-bar welding robot, the welding full-automatic is achieved and the production efficiency is improved.