You Do Need power plug adapter while traveling from Antigua and Barbuda to China.

Here is Why You Need An Adapter

The outlet and plug type used in China are A, C and I and in Antigua and Barbuda are A and B. This is how they look like.

Antigua and Barbuda

In Antigua and Barbuda, outlets of type A and B are in use.

Type A

Type B

China

In China, outlets of type A, C and I are in use.

Type A

Type C

Type I