The West Australian Liberal Party has voted in favour of a motion to investigate the state seceding from the federation.

The non-binding "WAxit" policy motion, put forward by the Brand division, passed 89-73 at the Liberal state conference on Sunday.

Western Australians voted to self-govern in 1933 but the move was overruled.

It called for the establishment of a committee "to examine the option of WA becoming an independent state within the Commonwealth".

The idea for the state to secede came in response to long-held unhappiness in the state with GST distribution.