The instability of the laser plasma interaction is expected to be greatly suppressed by reducing the coherence of the output pulse of the high-power laser facilities. Using the low-coherence light as the seed source and the Nd:glass as the amplifying medium, the first kJ low-coherence broadband laser was developed delivering 960 J pulses centered at 1 056 nm with a bandwidth of 13 nm. The output pulse has a coherence time of 300 fs and a pulse duration adjustable from 3 ns to 10 ns. The spectrum of laser pulse is smooth with no longitudinal mode structure. And the spectral phase is randomly distributed, which can realize uncorrelated tunable output of pulse waveform and spectral shape. This facility successfully demonstrates the unit and system integration technologies of the broadband low-coherence laser driver and provides a new experimental platform for laser plasma interaction and high energy density physics research.