The utility model discloses a modular industrial Ethernet exchanger which belongs to the industrial communication technical field. The utility model comprises a kilomega optical-fiber interface, a 100M optical-fiber interface, a 100M electrical interface, a power supply interface, a control interface and a power supply alarm interface. The utility model is characterized in that: the utility model consists of a large bottom plate and ten modules. The ten modules are respectively: a POW module, a CPU module, a GE module, an SWITCH module and six FE modules, wherein, the order from left to right is: the GE module, the POW module, the SWITCH module, the CPU module and the six adjustable FE modules. The kilomega optical-fiber interface, the 100M optical-fiber interface and the 100M electrical interface are arranged on lower cover plates of the modules, which is convenient for wiring; all interfaces in the modules are in the same line. Side plates of the modules adopt a single-rib design, which improves the heat dissipation area of the industrial exchanger and can ensure that the industrial exchanger works at the temperature between 40 DEG C below zero and 75 DEG C. The large bottom plate and the ten modules are totally-closed structures, thus the requirement of industrial outdoor field of a customer can be satisfied and the installation and conveyance can also be convenient. The modular industrial Ethernet exchanger has convenient wiring which can not be mutually affected, simple construction and beautiful appearance, and is particularly suitable for equipment screen in the severe industrial field.