Circuit for improving optocoupler response speed based on image current source

The present invention discloses a circuit for improving an optocoupler response speed based on an image current source. The circuit comprises an optocoupler triode, an input end circuit and an output end circuit which are connected with the optocoupler triode and an image current source taken as a load and formed by two image connection triodes, wherein the image current source is connected with the output end of the optocoupler triode, and the output end of the image current source outputs switch signals. The improved circuit obviously shortens the time-delay time of the optocoupler, reduces the current of the front and back ends of the optocoupler, overcomes the problems of the big discreteness of optocoupler CTR parameters and the optical attenuation, is high in transmission efficiency, good in universality and flexible in usage and is especially suitable for the data transmission in the intelligent ammeter industry.