The collection includes hoodies, T-shirts and a bag.
According to Bieber, H&M has not asked him for permission to sell the products.
"I wouldn't buy the collection if I were you.
The products H&M has made with me are garbage and I have not approved them," he writes on his Instagram Stories.
H&M denies the allegations.
"We have followed exactly the same procedure for approval as with all other licensed products and collaborations," says H&M in a comment.