Anti-racism protesters have been warned to stay away from an anti-Islam rally in Melbourne after a social media post by one of the nationalist group's leaders glorified the murder of a teenager.

A video posted to the Facebook page of far-right group the United Patriots Front showed CCTV footage of the killing of anti-racism activist Carlos Javier Palomino, who was stabbed in the heart by a neo-nazi on a packed train in Spain in 2007.

The video was posted ahead of the group's protest against Islam and Sharia Law at Parliament House on Saturday, which is being promoted as the "biggest patriot rally in Australian history", and is scheduled to follow a rally by Reclaim Australia earlier in the day.

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