The head of the city teachers union yesterday rejected an education-reform group’s request to survey all 76,000 teachers to determine whether they support changes to the “last in, first out” layoff law.

Educators 4 Excellence — which wants layoffs to be based on merit, not just seniority — complained that UFT President Michael Mulgrew backs LIFO without polling teachers to see what they want.

“We don’t know what the majority of New York City teachers really want because no one has asked them,” E4E co-founder Sydney Morris said in a letter to Mulgrew.

Mulgrew said a survey “would only bolster Mayor Bloomberg’s politically inspired layoff agenda.”