The present invention provides a vehicle door latch system which can relieve a releasing hold mode without the special operation of passengers. The vehicle door latch system comprises a latch, ratchets, an electric driving mechanism, a door linkage lever and a relieving and releasing mechanism, wherein when the ratchets are in the releasing holding mode that the ratchets are maintained at releasing positions, and by switching the relieving and releasing mechanism from a connection state to a cut-off state, the ratchets return back to matching positions.