Teddy spent two years collecting the tubs, which are typically sold with chocolates, sweets, or crackers inside.
At Prime Minister's Questions, Paul Holmes, the MP for Hamble Valley, said: "Teddy is a self-professed eco warrior on a mission to change the world.
"He started out by saving thousands of plastic chocolate and sweet tubs from landfill because they're not currently recyclable.
"Will the Prime Minister commit to asking his minister for local government to meet Teddy and myself to discuss how we make these tubs recyclable.
"And does he agree with me that no matter how small you are, you are never too little to make a big difference?"
Sir Keir welcomed Teddy and his mother, as MPs waved and smiled at the public gallery.
He said: "Many of us struggle for a whole lifetime to make an impact on government policy.
"Teddy is already having an impact and I'll make sure that he gets to speak to the relevant minister."
The six-year-old, whose hero is Sir David Attenborough, collected the tubs as part of Greene King's Tub2Pub charity appeal, which takes collections to a plastic reprocessing centre.
He previously said: "I'd heard we can't recycle these tubs in our normal recycling bin but I wanted to change that so I can save the world.
"We have one planet and we need to look after it."
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