The utility model provides a connecting structure for a primary plug and a busbar of a drawer cabinet. The connecting structure comprises C-shaped moving contacts of a primary plug arranged inside a drawer cabinet of a distribution cabinet, a static contact of the primary plug, and a secondary plug. The distribution cabinet is provided with a window corresponding to the primary plug, and the primary plug can pass through the window. The distribution cabinet is provided with a vertical busbar which has a rectangular structure and is vertically arranged. An insulating safety protection shield is inlaid in the window, and is provided with a pair of hollowed grooves in the horizontal direction corresponding to a group of C-shaped moving contacts at the tail end of the drawer cabinet. Two side contact terminals of the C-shaped moving contacts can pass through the hollowed grooves and clamp the vertical busbar. The insulating protection shield can protect an operator from touching the live busbar by hand.