A biaxial synchronization dual-shaft hinge includes a pivot shaft set including a first pivot shaft and a second pivot shaft arranged in parallel for the mounting of the top cover member and bottom base member of a dual-leaf mobile electronic device, a transmission device set including an interlocking member having a first pivot hole and a second pivot hole respectively coupled to the first pivot shaft and the second pivot shaft, a first driving member pivotally mounted in the first pivot hole and a second driving member pivotally mounted in the second pivot hole for enabling the first pivot shaft and the second pivot shaft to be synchronously rotated in reversed direction steadily.