The invention relates to the technical field of engineering construction, and discloses a suspension platform for high-rise building outer wall construction. The suspension platform comprises a driving bin, wherein adjusting bins are fixedly mounted on the two sides of the driving bin, adjusting plates are lifted through a telescopic machine, so that the meshing contact positions of long conical teeth and short conical teeth are changed, the transmission ratio is changed, the larger the width of the suspension platform is, the initial transmission ratio can be adjusted through the telescopic machine so that it can be guaranteed that the device can be parallel to the ground all the time for the suspension platforms with different widths in the whole operation process, the distance between a limiting disc and a limiting pipe can be reduced while the telescopic machine is adjusted, according to the device, the time interval from overspeed to jamming is shortened, so that the maximum speed which can be reached after overspeed is reduced, the problem that the safety performance of the device is reduced after the width and the mass of the suspension platform are increased is solved, and the practicability and the safety performance of the device for different suspension platforms are improved.