A normal salt solution is already neutral, acidic or basic by virtue of the characteristics of the particular ions, but the ions of the salt (anions and cations) are equal in numbers.
What it may do is buffer the pH.
The classical line for neutralisation is: Acid + base = salt + water only.
So you can see if the reaction were to be reversed (very hard work) the products would be an acid and a base in stoichemetric proportions.
If you add a solution of a metal salt of which the oxalate is insoluble, it will indeed precipitate away from solution all, or part of the acid , but will not be 'neutralised' in the chemistry form of understanding. It would simply be replaced with a similar amount of different acid (hydrogen ions and the acid radicle ion of the added salt).
I do hope you are referring to 'salt' in a chemical nature and not salt as common salt which is sodium chloride.
Regards, RAB