The invention provides a dynamic energy release device and equipment and a DC power supply system. The dynamic energy release device comprises at least two dynamic energy release modules which are connected in series between a DC power transmission line and a first ground wire. A first switch is arranged between the input end of the dynamic energy release modules and the DC power transmission lineand/or the first switch is arranged between the grounding end of the dynamic energy release modules and the first ground wire. A second ground wire is connected between the at least two series connected dynamic energy release modules. The first switch is disconnected in case of fault elimination of continuous phase change failure of the DC power transmission system so that the dynamic energy release device can be quickly cut off, the problem of slow system recovery caused by capacitance charging in the recovery process of the DC power supply system can be avoided, and the system is enabled toquickly recover normal operation. The second ground wire is arranged between the series connected dynamic energy release modules so that the system insulation level can be effectively reduced.