"External factors do affect our economy, but there are problems persisting from before," Larijani said at a press conference.
He listed a number of challenges, including "big, costly government", high interest rates that "disrupt production", cash-strapped pension funds and a water crisis.
Parliament's research centre had "repeatedly warned" of these challenges, Larijani said, but the government has yet to respond on key issues.
The United States' decision in May to withdraw from the 2015 nuclear deal and reimpose sanctions on Iran has added another layer of difficulty.
He dismissed US President Donald Trump's offer to open fresh negotiations on a new deal.
"We hear two types of rhetoric from the US president -- some cheap words and some talk on the side that they are ready for negotiation," he said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)