The present invention relates to a three-dimensional magnetic field measurement device comprising a plurality of modules, in which each module is configured to be extendable in x-axis, y-axis, and z-axis directions, whereby magnetic field data in a three-dimensional space can be measured in real time without moving the device, a measurement region can be easily expanded and reduced, power supply efficiency can be improved, and power consumption can be reduced. And the size and the weight of the device can be reduced.
