Abstract: A depth imaging system and a control method thereof are provided. The depth imaging system includes a first imaging device, a second imaging device, a sliding base, a detecting module, an estimating module, a calculating module, and a control module. The first imaging device and the second imaging device are mounted on the sliding base. The detecting module detects a target region of the first image and the second image. The estimating module estimates an initial depth of the target region. The calculating module calculates a baseline corresponding to the initial depth. The control module controls the sliding base to adjust a relative distance between the first imaging device and the second imaging device. The calculating module generates an adjusted baseline according to the adjusted relative distance between the first imaging device and the second imaging device, such that the adjusted baseline is closer to the calculated baseline.