The invention relates to the field of electric power, in particular to a household appliance energy consumption calculation system. The system comprises energy consumption calculating units, a serverand a client, wherein the energy consumption calculating units are respectively arranged at socket ends and are used for calculating the working energy consumption and the standby energy consumption of the household appliances connected with the corresponding socket ends; the server is used for receiving the working energy consumption data and the standby energy consumption data uploaded by each energy consumption calculation unit and processing the uploaded energy consumption data; and the client is used for sending the energy consumption query instruction to the server and receiving the datainformation returned by the server according to the energy consumption query instruction. According to the invention, a user can more intuitively know the working energy consumption data and the standby energy consumption data, so that a warning effect is achieved.