The invention discloses a moving contact linkage structure of a modularized circuit breaker. The moving contact linkage structure comprises a first shell, a second shell, a short shaft, an operating mechanism side plate, an operating mechanism lower connecting rod, a contact rotor, a first linkage block and a second linkage block, wherein the first shell and the second shell are respectively provided with a first mounting hole and a second mounting hole, and the position of the first mounting hole corresponds to that of the second mounting hole; the operating mechanism side plate is provided with a third through hole which is formed at a position corresponding to the rotation center of the contact rotor; the operating mechanism lower connecting rod is provided with a fourth through hole which is in splicing fit with the first short shaft; the contact rotor rotates around the rotation center, and matching surfaces are arranged on two sides of the contact rotor; the first linkage block is connected to the matching surface on the first side of the contact rotor; the second linkage block is connected to the matching surface on the second side of the contact rotor; and the contact rotor, the first linkage block and the second linkage block are arranged in the first mounting hole and the second mounting hole.