Does a EU visa holders need visa for Switzerland?

if you mean you're a Schengen TOURIST visa holder, the NO, you cannot travel to switzerland.

If you're a Schengen RESIDENCE/STUDENT visa holder, you must check, some countries do allow you to go to switzerland without asking for an extra visa (e.g. France and Germany).

following a rejection of membership to the European Economic Area in a referendum in December 1992, the Federal Council froze its EC application and sought instead to negotiate bilateral agreements with the EU covering a range of issues. These, known as 'Bilaterals I' and covering free movement of persons, trade in agricultural products, public procurement and transport for example, were agreed at the end of 1998 and approved by the people in a referendum in May 2000.

That means all European Union citizens can travel to Switzerland freely.

Since Switzerland is not in the EU, the answer is that (if you don't carry an EU passport) you have to meet the Swiss immigration requirements.

So you need to check if Switzerland requires a visa got visitors holding your country's passport