Direct current high voltage isolation sampling circuit

The invention provides a direct current high voltage isolation sampling circuit, comprising an isolation power supply conversion circuit, a voltage division circuit, a direct voltage isolation conversion circuit and a differential amplification circuit. The voltage division circuit is arranged on a sampling voltage input end of the direct voltage isolation conversion circuit, an isolation differential direct voltage output end of the direct voltage isolation conversion circuit is connected with a voltage input end of the differential amplification circuit, and a voltage input end of the differential amplification circuit is connected with a rear-stage control circuit and supplies direct voltage for sampling; and an isolation power supply output end of the isolation power supply conversion circuit is connected with a power supply input end of the direct voltage isolation conversion circuit and supplies working power supply. Thus, the isolation sampling circuit can remarkably reduce active loss of a sampling re