Stroll missed his braking point in damp conditions and side-swiped the Ferrari driver, sending Leclerc into a spin which tagged McLaren's Daniel Ricciardo and forced the Monegasque and Canadian into retirement.
For the incident, Stroll has been handed a five-place grid penalty for the Belgian Grand Prix.
"I don't know what to say," said Leclerc. "In most of the incidents, I can understand whenever there are different views about incidents but I think today it is very, very clear.
"I was in the corner and Lance drove into me in the middle of the corner coming out of nowhere.
"It is hugely frustrating because I knew it was an opportunity today. I went quite easy at the beginning to just try to stay in my position and make our race later on and to finish like this is just shit.
Asked how badly damaged his car was, Leclerc added: "It was big. I arrived at the braking point of the next corner and I basically spun straight away.
"The only thing I could see is that he was very very far away and then he hit me. The reason? I don't know but it is a shame."
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