Multiple-Ethernet electric-to-optical conversion device

The utility model relates to a multiple-Ethernet electric-to-optical conversion device, through judging the size of the parallel data digit m which can be processed by the parallel-to-serial converting of a light receiving module and the size of the data main digit 5*n of a plurality of Ethernets, if the parallel data digit m >=5*n, data frames of a plurality of the Ethernets are directly and orderly mapped in fixed virtual circuits, which enables the data of a plurality of the Ethernets to be transmitted on the same optical fiber, and enables the Ethernets to be physically insulated with eachother, and the device has the advantages of small time delay and saving the resources of light channels, if the parallel data digit m