can i renew my wife passport who is Chinese citizen in china embassy and what all document required.

Hello, man, I’m afraid you cannot renew it online for her. Because according to the requirements, the applicant must go to the embassy in person. The following documents are needed: the original passport and copy of its data page, the valid residence permit in India, the application form, 3 passport-style color photos, the letter of application written by your wife. Afterwards, your wife should submit the application to the consulate general by herself and handle relevant procedures.
You don’t have to make an appointment in advance.