You should have a family in Qatar, meaning your wife should be having a Residency permit.
Then you can apply for a family visit visa. here are the requirements as shared by "britexpat"

Requirements for applying Visa for relatives:
• copy of personal id or passport of the sponsor
• Copy of sponsor's wife passport with valid residence permit or residential tenancy contract
• Letter from employer of the sponsor citing profession and salary
• Valid passport copy of the visitor
• Documents to prove relationship