An alignment mechanism for automatic charging, comprising: a first substrate, disposed in a vertical direction; a second substrate, disposed opposite to the first substrate; a first spring, both ends connected to surfaces of the first substrate and the second substrate which face each other, respectively; and a limiting assembly, disposed between the first substrate and the second substrate; wherein the limiting assembly comprises at least two limiting plates which are disposed parallel to each other and are in a same horizontal plane, and each of the two limiting plates has both ends connected to the first substrate and the second substrate respectively in such a manner that the limiting plate is rotatable in the horizontal plane; and a surface of the second substrate facing away from the first substrate is configured to connect a first connector, which is a connector of a charging device to be charged.