We propose and numerically demonstrate that short cavity semiconductor laser with dual-optical-feedback can stably generate broadband chaotic signal. Through theoretical analysis and comparison of the effects of the feedback factors on the dynamic characteristics of the laser with single-optical-feedback and dual-optical-feedback structure, it was found that the short cavity semiconductor laser with dual-optical-feedback can generate chaotic signals within a large parameters range. The analysis of the signal characteristics of different output states of the laser shows that the laser with dual-optical-feedback structure evolves through a period-doubling bifurcation leading to chaos.In addition, the influence of the feedback factors of the dual cavity on the bandwidth of the output signal was studied,and it was identified that the bandwidth of the chaotic signal generated by the laser with dual-optical-feedback structure can reach over 10 GHz, and gradually increases with the increase of the feedback factors.