Power battery load simulation circuit and equipment box thereof

The utility model discloses a power battery load simulation circuit and an equipment box thereof. The circuit comprises a charging capacitor module, a current limiting module, a power supply connection port module and a discharging connection port module. The charging capacitor module is connected in series with the current limiting module, and the current limiting module is connected with the power supply connecting port module and the discharging connecting port module through a charging and discharging switch; the charging and discharging switch is a three-port switch, the current limiting module is connected to a common end of the three-port switch, a positive electrode end of the power supply connecting port module is connected to a first switching port of the three-port switch, and a first port of the discharging connecting port module is connected to a second switching port of the three-port switch; the negative electrode end of the power supply connection port module and the second port of the dischar