The utility model discloses a multichannel centralized monitoring instrument. The instrument comprises a power supply unit, a general packet radio service (GPRS) monitoring unit, a recommended standard 485 (RS485) monitoring unit, an embedded secure access module (ESAM) monitoring unit and a carrier monitoring unit. The instrument adopts a multichannel acquisition unit circuit centralized design, input and output interfaces are unified, and the time to live (TTL) signals, RS232 signals and RS485 signals of a concentrator and meters in a grid system are converted and coordinated, so that different signal transmissions are realized. The instrument adopts a common chip in the market as a chip, and a male mould serves as a shell, so that the instrument is low in cost; the instrument has high concentration ratio and is conveniently wired and installed by users; all the interfaces are subjected to isolation treatment, so that tested equipment is effectively protected, and the instrument is safe to use; and the instrument has a stable system, strong functions and a wide application scope. The instrument can be used for effectively solving the problems of different monitoring mode requirements of different signals, complicated lines, potential safety hazards and the like, and an important solid foundation is laid for 'full acquiring, full covering and full charge controlling' smart grid electricity information acquisition systems.