A high brightness fiber coupling laser module with multiplex diode lasers (LDs) has been designed and fabricated. The diode laser chips has been fabricated with AlGaAs/GaAs material with broad waveguide and double quantum wells structure by molecular beam epitaxy (MBE), and the module contains 4 collimated single broad area stripe diode lasers which can reach to continuous wave (CW) 5 W output power with emission width of 100 μm and cavity length of 2 mm. Output combination with high beam quality has been obtained by first space beam combination of each two devices and consequent polarization beam combination,and the combined four-beam output has been coupled into a 100 μm-core quartz fiber with numerical aperture (NA) 0.22 by a simple flat-convex lens. Finally, a 10.17 W output power from the fiber with a high power density of 1.0×105 W/cm2 is achieved, and the total coupling efficiency is as high as 79%.