Do I need to change the plug when I bring home German household appliances?

No need.

The standard voltage of German electrical appliances is 100-240V, which can be used in China. 100V-240V is an electrical appliance with a wide working voltage range, which can be used in both power supply systems with a nominal voltage of 220V (such as China) and 1 10V (such as the United States). As long as the input voltage is between 100 volts and 240 volts, the instrument can work stably and reliably. Input voltage is 220V: it can only be used in the power supply system with a nominal voltage of 220V, and the voltage fluctuation range does not exceed +- 15%.

In China, flat or splayed plugs of 220 V and 50 Hz are usually used. Germany usually uses two-pin flat plug or two-pin flat plug with round grounding pin, 100v 50Hz.

Extended data:

GB plug application: China, Argentina, Australia, New Zealand, New Guinea, Melanesia, Micronesia, Polynesia and other places.

American standard socket application scope: USA, Canada, Japan, Brazil, Philippines, Thailand and other countries.

Scope of application: Britain, Pakistan, Singapore, Malaysia, Vietnam, Indonesia, Maldives, Qatar and other countries and regions.

German standard plug application scope: Germany, Austria, Switzerland, Italy, Netherlands, Belgium, France, Spain, Portugal, Denmark, Norway, Sweden, Finland, Greece, Turkey and other European countries or regions.

South Africa standard plug application scope: South Africa, India and other places.

Baidu Encyclopedia-Input Voltage

People's Network-Small Popular Science on Electricity Consumption in Various Countries