Provided is a method for monitoring a field based on augmented reality using a digital twin performed in a processor of a computing device of a manager located remotely from a physical space of a field, including: outputting a field twin model of a three-dimensional virtual space matched to the physical space of the field; acquiring location information of a field user for the physical space based on positioning sensor data received from a field sensor system arranged in the field; and displaying a first virtual content representing a location of the field user on the field twin model by matching location information of the field user for the physical space to the three-dimensional virtual space.