The utility model relates to a voltage regulator protection, measurement and control device of a railway power substation applicable to passenger special lines, mainly comprising a signal plugin and an alternating-current plugin and a power supply plugin which are respectively connected with the signal plugin, wherein the internal structure of the signal plugin comprises a bus and a 16-bit A/D converter, a double-port RAM, a CPU, a program storage FLASH RAM, a constant value and report memory FLASHRAM, a data storage SRAM, a reset chip, a clock chip and a USB interface chip which are respectively connected with the bus; and the double-port RAM is provided with a network interface which adopts a plug-in card mode and supports optical-fiber redundancy self-healing dual-ring network structure. The voltage regulator protection, measurement and control device not only can complete the integrated function of protection, measurement and control of a voltage regulator, but also has complete function, compact and small structure and higher reliability.