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

Here is Why You Need An Adapter

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

Denmark

In Denmark, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K

Canary Islands

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

Type C

Type E

Type F