Members at the Labor Party's annual state conference voted on the weekend for a proposal that would see one third of the vote for any future parliamentary leader come from affiliated unions.

One third would come from the Labor Party's parliamentary caucus, with the remaining third from a ballot of rank-and-file members.

National Union of Workers national secretary Tim Kennedy said his union was keen to allow its own rank-and-file to have their say.

Mr Kennedy said the NUW's Queensland branch would allocate its votes in a bloc, which would be decided after a ballot of its members.

The NUW has four of the 210 union votes at the Queensland Labor Party state conference. All four votes would be allocated to the members' choice.

"We believe the Labor Party needs to become a mass party and it needs to better reflect the community it seeks to represent in Parliament," Mr Kennedy told Fairfax Media.

"The way you do that is to get more and more people involved in these processes, whether it be in its public office procedures or its policy procedures.

"One of the ways to do that is through union members of affiliated unions. Where some of that union fee goes to the ALP, give them a voice in the party.

"All of a sudden, the party goes from having a fundamentally fairly small membership base to potentially, nationwide, engaging with up to 1.3 million Australians who are members of a union."

If an NUW member was also a member of the Labor Party, he or she would be able to vote twice – once to decide their union's position and a more weighted ALP branch vote.

Mr Kennedy said he would like to see other states follow Queensland's lead and open leadership ballots to Labor Party members.

He also said he hoped other unions would follow the NUW's lead.

Comment was sought from Queensland Labor Party state secretary Anthony Chisholm.

Fairfax Media first revealed the proposed changes to Labor's Queensland leadership rules last November, prior to the party's 2013 state conference.