Based on Python language, a semiconductor laser diode simulation EDA program with UI interface is written. The program can set the material composition of the active area of the semiconductor laser diode chip, analyze the material parameters and calculate the waveguide refractive index, draw the refractive index distribution curve and the light intensity distribution curve, calculate the energy band structure and gain characteristics of the active area of the chip, and draw the optical gain spectrum curve under different carrier concentrations. Use the EDA program, the semiconductor laser diode chip with 791 nm wavelength is simulated. The chip which light-emitting region width is 190 μm and cavity length is 4 mm has a peak power of 16.25 W at 15 A current.