A device for counting faults of household appliances, characterized in that, comprising: a signal receiver, configured to acquire operating parameter information of a plurality of household appliances, wherein the plurality of household appliances being equipped with preset parts, wherein preset parts refer to a type of parts having the same structural features and functional characteristics, wherein one of the preset parts is a new part and a small part batch of n household appliances has been produced, and all of the n household appliances are equipped with the new part, wherein since the plurality of household appliances are equipped with the preset parts, the part batches of the plurality of household appliances are the same, so that the part batches correspond to the preset parts; and the signal receiver is configured to receive a fault report message of at least one faulty household appliance in the plurality of household appliances, wherein the fault report message carry fault codes and the MAC address of the faulty appliances, wherein the signal receiver, configured to receive monitoring results of the plurality of household appliances equipped with the preset parts, wherein the monitoring results carry an operation log of each of the plurality of household appliances, and a processor, configured to take the operation log of the faulty household appliance in a fault time period by using the MAC address of the faulty household appliance as an index, wherein the fault time period is a time period in a fixed duration before and after a time point when the fault report message is received, the processor, configured to determine a fault of the faulty household appliance according to the fault code and the operation log of the faulty household appliance in the fault time period, and calculate fault rates of the plurality of household appliances in the part batches corresponding to the fault according to the operating parameter information and the fault codes, wherein the device further comprises a signal transmitter; the processor is further configured to compare the fault rate with a preset fault threshold, and transmit the fault rate to the signal transmitter when the fault rate is greater than the fault threshold; and the signal transmitter is configured to transmit the fault rates to a fault counting system. a signal receiver, configured to acquire operating parameter information of a plurality of household appliances, wherein the plurality of household appliances being equipped with preset parts, wherein preset parts refer to a type of parts having the same structural features and functional characteristics, wherein one of the preset parts is a new part and a small part batch of n household appliances has been produced, and all of the n household appliances are equipped with the new part, wherein since the plurality of household appliances are equipped with the preset parts, the part batches of the plurality of household appliances are the same, so that the part batches correspond to the preset parts; and the signal receiver is configured to receive a fault report message of at least one faulty household appliance in the plurality of household appliances, wherein the fault report message carry fault codes and the MAC address of the faulty appliances, wherein the signal receiver, configured to receive monitoring results of the plurality of household appliances equipped with the preset parts, wherein the monitoring results carry an operation log of each of the plurality of household appliances, and a processor, configured to take the operation log of the faulty household appliance in a fault time period by using the MAC address of the faulty household appliance as an index, wherein the fault time period is a time period in a fixed duration before and after a time point when the fault report message is received, the processor, configured to determine a fault of the faulty household appliance according to the fault code and the operation log of the faulty household appliance in the fault time period, and calculate fault rates of the plurality of household appliances in the part batches corresponding to the fault according to the operating parameter information and the fault codes, wherein the device further comprises a signal transmitter; the processor is further configured to compare the fault rate with a preset fault threshold, and transmit the fault rate to the signal transmitter when the fault rate is greater than the fault threshold; and the signal transmitter is configured to transmit the fault rates to a fault counting system.