Utilizing two section passive mode-locked laser structure, a monolithic high-power quantum well passive mode-locked laser operating in the near-infrared band is realized by cascading two quantum well active regions by the tunnel junction. The mode-locked characteristics of the model-locked laser are measured. The results show that the center wavelength of this laser is 1038 nm, the pulse repetition frequency is 24.37 GHz, and when the working condition of lasers changes, the pulse width varies from 2.19 ps to 9.27 ps. The peak power variation range is from 76 mW to 308 mW. It shows that the mode-locked laser has the advantages of monolithic integration, compact size, high power and high repetition frequency. Meanwhile, under certain reverse bias conditions, the mode-locked laser exhibits the characteristics of power bistability and enlarges the effective mode-locking range.