No.
No. El Salvador last qualified 1970
I think you mean to ask, "Did El Salvador ever win the world cup?" The answer is no, no CONCACAF team has won the World Cup.
El Salvador became the first Central American team to qualify to a fifa world cup; firstly in 1970, and also the first to do so twice; in 1982.
0 times
1970
1982 Hungary destroys El Salvador 10-1.
yes
Honduras and El Salvador 1969 World Cup Qualifier
As of the 2010 FIFA World Cup, El Salvador has qualified twice. In 1970, they finished 16th and in 1982, they finished 24th.
http://en.wikipedia.org/wiki/1970_FIFA_World_Cup_qualification#North.2C_Central_America_and_Caribbean_.28CONCACAF.29
The first round match between Hungary and El Salvador in the 1st Round which Hungary won 10-1 is the highest recorded score in the World Cup finals
No they have never won it.