The utility model discloses an electrical grounding detection circuit, which comprises a voltage-dividing circuit connected with the power supply of detected equipment and the ground terminal of the detected equipment, the power supply of the detected equipment is two-phase, the two-phase power supply is respectively connected with the primary of an electromagnetic transformer through divider resistors, the primary of the electromagnetic transformer comprises two windings which have the same parameters and are in opposite directions, one end of each winding is connected with the two-phase power supply, the other ends of the two windings are connected with the ground terminal of the detected equipment, both ends of the secondary coil of the electromagnetic transformer are connected with both ends of a detection resistor, the output of the detection resistor is connected with the positive input end of a comparator, the negative input end of the comparator is connected with comparative voltage, and the output end of the comparator is connected with the cathode of a detection circuit through a light-emitting diode and a resistor. The simple electrical grounding detection circuit can detect the grounding condition, is simple and intuitive, and can be widely applied in the field of grounding detection.