The logo consists of a spanner that portrayed the hopes and aspirations of the working class, an octagon shape representing multi-racialism in Singapore, and eight cogs of a wheel, representing:
- National solidarity and well-being
- Dignity of labour
- Brotherhood of workers
- Industrial peace with justice
- Modernisation of the Labour Movement
- Progress of labour
- Cooperation of labour
- Co-equal in the tripartite partnership of labour, government and management in the social, economic and political advancement of Singapore.
The colour scheme consists of a red that represents the international brotherhood of workers, while the white stands for purity, honesty and integrity of the Labour Movement.
In 2008, it was replaced when the union underwent a rebranding exercise.