High beam quality, high power fiber coupled diode laser has extensive requirements in the field of industrial processing applications. Micro-optics beam transform system (BTS) has been employed to transform the beam emitted from standard cm-bar semiconductor with 19 emitters, the beam quality along the slow axis has been improved. Compact spatial multiplexing module is designed, and balanced beam quality in both directions of combined beam is achieved, four spatial multiplexing modules are employed in polarization multiplexing and wavelength multiplexing, the output beam is coupled into a fiber with core diameter of 400 μm, numerial aperture (NA) of 0.22. The maximum fiber-coupled output power of 1070 W, the coupling efficiency of 96.3%, and the electro-optical conversion efficiency of 43% are achieved. The instability of output power is less than 1%, by measuring the maximum output power for 1 h.