The invention relates to a night vision system based on an NB-IOT signal as well as an implementation method thereof. The night vision system comprises a signal receiving module, a communication module, a coordinate receiving module and a software module, wherein the signal receiving module is used for receiving a first radio frequency signal transmitted from an NB-IOT base station and a second radio frequency signal returned from an observation area and outputting a first signal and a second signal after amplification, filtering and analog-to-digital conversion are performed; the communication module is used for transmitting the first signal and the second signal, which are output by the signal receiving module, to the software module; the coordinate receiving module is used for acquiringreal-time coordinates of the night vision system and transmitting to the software module; and the software module comprises first to seventh sub modules and is used for performing a series of processing on the first signal and the second signal and performing two-dimensional time domain filtering processing by combining the real-time coordinates, acquired by the coordinate receiving module, of the night vision system and coordinates of the NB-IOT base station, thus an image of the observation area is acquired. The night vision system provided by the invention can solve the problems that imageresolution of an existing night vision system is low and price of the existing night vision system is high.