The invention discloses a quasi-digital frequency modulation flux gate current sensor. The quasi-digital frequency modulation flux gate current sensor comprises a double flux gate probe, wherein a self excitation circuit is connected with an upper flux gate probe, the double flux gate probe comprises a first magnetic ring and a second magnetic ring of which two circle centers are on one straight line, the first magnetic ring and the second magnetic ring are respectively wound with a first coil and a second coil, the winding direction of the first coil is opposite to the winding direction of the second coil, the self excitation circuit is a hysteresis comparison circuit and comprises an operational amplifier and a self excitation circuit, and the first magnetic ring and the second magnetic ring are connected in parallel between an anti-phase input end and an output end of the operational amplifier. The quasi-digital frequency modulation flux gate current sensor is advantaged in that not only can measurement precision and sensitivity be guaranteed, but also quasi-digital measurement requirements can be further satisfied.