A building comprising a DC home power consumption system, wherein the building comprises a plurality of home appliances, the DC home power consumption system comprises: a home power supply, configured to supply power for the home power consumption system; a high-voltage DC bus, connected to the home power supply and configured to supply power for a high-power appliance; and a low-voltage DC bus, connected to the home power supply or the high-voltage DC bus and configured to supply power for a low-power appliance, wherein the high-voltage DC bus is located in an upper part of a home space, and the low-voltage DC bus is located in a lower part of the home space for realizing space isolation of high and low voltage to ensure safety and reliability of overall home electricity, wherein the high-voltage DC bus is configured to supply power for a high-power appliance and the low-voltage DC bus is configured to supply power for a low-power appliance according to a priority of electricity parameters of a home appliance, the electricity parameters at least comprise: power, a usage frequency and a user requirement, and the priority of the electricity parameters is: a priority of the power > a priority of the usage frequency > a priority of the user requirement, wherein the home appliance is connected to the high-voltage DC bus when the power of the home appliance is greater than a first preset power; the home appliance is connected to the low-voltage DC bus when the power of the home appliance is less than a second preset power; and the home appliance is connected to the high-voltage DC bus or the low-voltage DC bus according to the usage frequency of the home appliance when the power of the home appliance is less than or equal to the first preset power and greater than or equal to the second preset power; wherein the home appliance is connected to the low-voltage DC bus when the home appliance is in a frequent activity area; and the home appliance is connected to the high-voltage DC bus or the low-voltage DC bus according to the use requirement of the home appliance, when the home appliance is in a living function area. a home power supply, configured to supply power for the home power consumption system; a high-voltage DC bus, connected to the home power supply and configured to supply power for a high-power appliance; and a low-voltage DC bus, connected to the home power supply or the high-voltage DC bus and configured to supply power for a low-power appliance, wherein the high-voltage DC bus is located in an upper part of a home space, and the low-voltage DC bus is located in a lower part of the home space for realizing space isolation of high and low voltage to ensure safety and reliability of overall home electricity, wherein the high-voltage DC bus is configured to supply power for a high-power appliance and the low-voltage DC bus is configured to supply power for a low-power appliance according to a priority of electricity parameters of a home appliance, the electricity parameters at least comprise: power, a usage frequency and a user requirement, and the priority of the electricity parameters is: a priority of the power > a priority of the usage frequency > a priority of the user requirement, wherein the home appliance is connected to the high-voltage DC bus when the power of the home appliance is greater than a first preset power; the home appliance is connected to the low-voltage DC bus when the power of the home appliance is less than a second preset power; and the home appliance is connected to the high-voltage DC bus or the low-voltage DC bus according to the usage frequency of the home appliance when the power of the home appliance is less than or equal to the first preset power and greater than or equal to the second preset power; wherein the home appliance is connected to the low-voltage DC bus when the home appliance is in a frequent activity area; and the home appliance is connected to the high-voltage DC bus or the low-voltage DC bus according to the use requirement of the home appliance, when the home appliance is in a living function area.