You Do Need power plug adapter while traveling from Mauritius to China.

Here is Why You Need An Adapter

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

Mauritius

In Mauritius, outlets of type C and G are in use.

Type C

Type G

China

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

Type A

Type C

Type I