The invention discloses a rectangular electric connector comprising a connector shell and a power contact member, wherein the power contact is arranged in the connector shell; the front part and the rear part of the power contact are respectively provided with a groove positioned between rear contact fingers and a bent inclined slice part positioned on the end part of a front contact finger, thusthe power contact can be locked and matched with a front beam and a jib which are correspondingly arranged in a contact installation cavity of the connector shell to realize fixation through barbs when forwards inserted into the corresponding contact installation cavity arranged in the connector shell from the rear end of the electric connector; and the barbs and the groove of the power contact can be separated to realize unlocking by only pressing the jib on the front end of the electric connector through an inserting channel during disassembly, therefore the disassembly is very convenient.