The invention provides a strut type combination electronic transformer combined with a disconnecting switch. The strut type combination electronic transformer comprises a current sensor, a voltage sensor, a self-excitation power source, an insulation strut and a merging unit. The voltage sensor and the current sensor transmit collected voltage signals and collected current signals respectively to the merging unit through a photoelectricity mixed signal cable. The insulation strut is located between a high-voltage conductor and a base support, and the self-excitation power source provides electric energy for an electrical-to-optical converter of the current sensor. The technical advantages of optical isolation insulation, digital output, networked wiring and minitype structures of the strut type combination electronic transformer are fully performed, the disconnecting switch and the electronic current and voltage transformer are integrally combined, the manufacturing cost is lowered, the space occupied by equipment is decreased, and an intelligent function is achieved.