A multi-level direct current converter, wherein the multi-level direct current converter comprises a direct current conversion unit, a switching unit, a voltage management unit, and a controller, wherein the direct current conversion unit comprises a flying capacitor and at least two power transistors (M1, M2...M(2N-2) connected in series, the at least two power transistors comprise a first power transistor and a second power transistor M(2N-2), a first end of the first power transistor is connected to a voltage input end (Vin) of the multi-level direct current converter, a second end of the first power transistor is connected to a first end of the flying capacitor and a second end of the flying capacitor is connected to a first end of the second power transistor and a second end of the second power transistor is connected to a reference ground; the switching unit is arranged to connect an output end of the voltage management unit to a third end of the first power transistor and the voltage management unit is configured to provide a preset voltage for the first power transistor; and the controller is connected to the switching unit and a third end of the second power transistor, and is configured to: when detecting that an input voltage of the voltage input end starts to rise from an initial voltage, control the switching unit to connect the voltage management unit to the first power transistor, and control the second power transistor to be conducted; wherein the multi-level direct current converter is an N-level direct current converter; characterized in that the voltage management unit comprises a first resistor, a second resistor, a direct current source, and a third power transistor, wherein one end of the first resistor is connected to the voltage input end and one end of the direct current source, the other end of the first resistor is connected to one end of the second resistor and a gate of the third power transistor, the other end of the second resistor is connected to the reference ground, the other end of the direct current source is connected to a second end of the third power transistor, a third end of the third power transistor is connected to the reference ground, and a ratio between a resistance value of the first resistor and a resistance value of the second resistor is 1/( N - 2), wherein N is an integer greater than 2, wherein the second end of the third power transistor is the output end of the voltage management unit. the switching unit is arranged to connect an output end of the voltage management unit to a third end of the first power transistor and the voltage management unit is configured to provide a preset voltage for the first power transistor; and the controller is connected to the switching unit and a third end of the second power transistor, and is configured to: when detecting that an input voltage of the voltage input end starts to rise from an initial voltage, control the switching unit to connect the voltage management unit to the first power transistor, and control the second power transistor to be conducted; wherein the multi-level direct current converter is an N-level direct current converter; characterized in that the voltage management unit comprises a first resistor, a second resistor, a direct current source, and a third power transistor, wherein one end of the first resistor is connected to the voltage input end and one end of the direct current source, the other end of the first resistor is connected to one end of the second resistor and a gate of the third power transistor, the other end of the second resistor is connected to the reference ground, the other end of the direct current source is connected to a second end of the third power transistor, a third end of the third power transistor is connected to the reference ground, and a ratio between a resistance value of the first resistor and a resistance value of the second resistor is 1/( N - 2), wherein N is an integer greater than 2, wherein the second end of the third power transistor is the output end of the voltage management unit.