Conversion type function relay

The invention relates to a conversion type function relay. The conversion type function relay comprises an input end, an output end, a light-emitting diode, a photosensitive diode array, a depletion type MOS tube M1 and an enhanced type MOS tube M2; the input end comprises a positive input pin and a negative input pin; the output end comprises a public pin, a normal-close pin and a normal-open pin; the anode of the light-emitting diode is connected with the positive input pin, and the cathode is connected with the negative input pin; the photosensitive diode array closes to the light-emittingdiode; the anode of the photosensitive diode array is connected with the grid of the depletion type MOS tube M1, and the drain of the depletion type MOS tube M1 is connected with the normal-close pin,and the source is connected with the public pin; the grid of the enhanced type MOS tube M2 is connected with the cathode of the photosensitive diode array, the drain of the enhanced type MOS tube M2is connected with the norma