The invention discloses a coherent population trapping (CPT) rubidium atom magnetometer. The CPT rubidium atom magnetometer comprises a vertical cavity surface emitting laser (VCSEL), a collimating lens, a gamma/4 wave plate, an indium tin oxide (ITO) heater, an atomic vapor cell, a magnetic shielding barrel, a photovoltaic detector, a data collecting module, a temperature control module, an uppercomputer and a circuit control module. Under the action of a magnetic field in parallel to a light path, CPT signals generated by a modulating laser which passes through the rubidium atomic vapor cell are measured, and then according to the relation between the frequency difference and the magnetic field intensity of the CPT signals, precise measurement of the magnetic field is realized. The CPTrubidium atom magnetometer reduces the interference of external tangled magnetic fields, improves the stability of the output CPT signals, has the advantages that the sensitivity is high, the power consumption is low, the size is small and the like, and has significant application value in the aspects of biomedicine, geophysics, quantum frequency standard, military detection and the like.