The invention provides a socket assembly and a charging rack for a power battery. The socket assembly comprises at least one rail arranged to extend in a vertical direction; a body configured to movealong the rail; an elastic member, wherein one end of the elastic member is attached to the body and the other end is fixed with respect to the rail; an activation plate arranged below the body; and alever mechanism connected between the activation plate and the body; wherein a lever mechanism is configured such that the activation plate and the body can be synchronously moved in the same direction, and the moving speed of the body is greater than the moving speed of the activation plate. The socket assembly and the charging rack have the advantages of simplicity, reliability, convenience inmaintenance and the like, the working efficiency of the power battery charging device can be improved, and the operation cost is reduced.