Is it legal it set up a lemonade stand in Australia?

Well, It depends in which area you are looking at...

Some areas require a ABN (Australian business number) but you are not trying to open a business, you will be considering it as a hobby... You can sell them at the beach where you can get a lot of pocket money... Look up in google " Lemonade Stand in Australia" There will be a map, and on the map, it tells you if you can sell it.

Good Luck,

I doesn't matter but you have take in consideration that your lemonade recipe has to be clean.

Thank You