A backplane connector includes a number of wafers and a spacer for assembling the wafers together. Each wafer includes an insulating frame and a number of conductive terminals fixed to the insulating frame. The insulating bracket includes a first protrusion and a second protrusion. The spacer includes a first body portion and a second body portion. The first body portion includes a first clamping slot for clamping the first protrusion. The second body portion includes a second clamping slot for clamping the second protrusion. The present disclosure increases the ability of the spacer to resist external forces and improves the structural stability of the backplane connector.