I have a person who regularly makes mistakes in spelling or the data he writes are wrong, so I want to tell someone that
(Please check and confirm the data or spellings before you send email or letter).
Is there any phrase for it?
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In formal writing, you may use the words accuracy, precision, cohesion, or completeness in whatever sentence you make. I suggest to formally write him/her, "Please ensure accuracy, precision, and cohesion of the contents before sending ...". In informal writing, your phrase would work or you may mix suggested words with your sentence. Better to use 'verify' instead of confirm.
Seeing as you mention problems with data, I would say that they should sanity check their work:
The act of checking that something does not contain elementary mistakes or impossibilities, or is not based on invalid assumptions