Thanks for asking the query,
Salty taste in mouth can be due to GIT disturbances and post nasal sinus
I would suggest you to visit to an Gasteroenterologist and ENT specialist
and get the checkup done.
Take necessary medications to keep the conditions under control.
Maintain a good oral hygiene
, clean the tongue gently with a tongue scraper, or a soft bristle toothbrush, use antiseptic mouthwash gargles twice daily.
Hope this helps out.