The utility model discloses a multi-electrode low voltage dual point circuit breaker with plastic casing, which is characterized in that: two arc extinguish chambers of each electrode are formed by assembling relatively independent sealing units; moving contacts of each electrode are arranged on the same rotating shaft through contact supports; the contact supports are connected with an operating mechanism arranged on one of small shells through a connecting rod; an interelectrode partition wall is arranged on a big shell; a bearing for supporting the rotating shaft is arranged on the interelectrode partition wall. The utility model adopts a relatively simple structure to achieve the reliable mechanical connection and transmission among unipolar units, meanwhile, causes installation more flexible and convenient, can simplify assembly process, and reduces manufacturing cost.