As civil diode laser cladding sources rely heavily on import from the occident, this paper developed a diode laser source which could continuous output ten thousands of watt powers. The light paths of the diode laser was simulated by ZEMAX, including the designs of beam arrangement, collimation lens and focus units. Four diode laser stacks with wavelengths of 915 nm and 976 nm respectively were used in an experiment and their beams were combined by the technologies of polarization combination and wavelength combination. A focusing experiment was performed by the focusing system developed by oursevles and the experiment results show that when an current of 122 A is inputted, the output power and the total electrical-optical conversion efficiency of this laser cladding source are 10 120 W and 46%, respectively, and the beam spot size is 2.5 mm×18 mm at working surface. This diode laser source can meet the need of large area and rapid laser cladding and heat treatment in industry.