A sliding mechanism includes a case, a sliding assembly mounted in the case and a stopping assembly. The sliding assembly includes a sliding member and a driving member supplying power for the sliding member. The stopping assembly includes a resisting portion mounted in the case, two first sliders and a pushing portion positioned on the resisting portion, and two first elastic portions. The resisting portion includes two slant surfaces. The first elastic portions resist the first sliders and the resisting portion. The first sliders are driven by the pushing portion to move along the slant surfaces of the resisting portion and away from the resisting portion, thereof compressing the first elastic portions. The first sliders are driven by the elastic forces of the first elastic portions to move along the slant surfaces and toward the sliding member, thereof clamping the sliding member.