Optical fiber terminal device and data transmission system

The invention discloses an optical fiber terminal device and a data transmission system, and the optical fiber terminal device comprises a housing which is internally provided with an installation cavity; the electromagnetic generation assembly is arranged in the mounting cavity; the electromagnetic generation assembly is suitable for being connected with an output current of an in-situ sensor; after the output current is introduced into the electromagnetic generation assembly, the electromagnetic generation assembly generates an induced magnetic field; the optical fiber assembly is arranged in the mounting cavity; the optical fiber assembly comprises a transmission optical fiber, and at least part of the transmission optical fiber is located in the induced magnetic field. According to the arrangement, based on the optical fiber weak current sensing principle, an optical sensing transmission path of in-situ sensor electric signals is constructed, and the anti-electromagnetic interference capability in the sen