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This question already has an answer here:

How to show product rating on filter Magento. I am trying to show filters in the form of product rating stars. Please help, how to show?

marked as duplicate by liyakat, Prince Patel, Rajeev K Tomy, Amit Bera, benmarks Jul 10 '17 at 20:50

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Note: This solution is incomplete for an already running store.

Please follow below steps to have a basic idea:

  • Create an attribute for that and add that attribute to layered navigation.
  • Observe the event review_save_after. In this event, you can get the product and review summary, and update your attribute value from this every time when a review is saved.

You can check the similar logic's code in the answer from @The Hien at this URL.

Also, you can try this extension, if you don't want to code yourself.

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