+0

He earns money through interest.

Please check it.

+0

That sentence is possible. Unfortunately I would need to see full context to judge how well it works, and whether it would be more natural to say it some other way.

Comments  
Students: We have free audio pronunciation exercises.

He runs a small financial agency at home itself, where he lends out money to others and collects interests from them.

He fully focuses on earning money through interest without doing the other job.

He is dedicated to earning money through interest without doing the other job.

kumenglishHe runs a small financial agency at home itself, where he lends out money to others and collects interests from them.
He fully focuses on earning money through interest without doing the other job.
He is dedicated to earning money through interest without doing the other job.

"earning/earns money through interest" does not by itself clearly convey that he is a money-lender. You can say e.g. "He is a money-lender. His (only) income is the interest he collects from his loans."