Based on Python language, a semiconductor laser diode simulation EDA program with UI interface was written. The program could 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. Using the EDA program, the semiconductor laser diode chip with 791 nm wavelength was simulated. The chip with light-emitting region width of 190 μm and cavity length of 4 mm was fabricated and it has a peak power of 16.25 W at 15 A current.