You Do Need power plug adapter while traveling from Canary Islands to Barbados.

Here is Why You Need An Adapter

The outlet and plug type used in Barbados are A and B and in Canary Islands are C, E and F. This is how they look like.

Canary Islands

In Canary Islands, outlets of type C, E and F are in use.

Type C

Type E

Type F

Barbados

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

Type A

Type B