Two senators who are among the sponsors of a resolution calling for a U.S-Soviet freeze on nuclear weapons have charged that Secretary of State Alexander M. Haig Jr. misrepresented their position in stating the Reagan administration's opposition to the proposal.

Edward M. Kennedy (D-Mass.) and Mark O. Hatfield (R-Ore.) are among 19 senators and 122 House members who have introduced joint resolutions calling for a mutual freeze on testing, production and further deployment of nuclear warheads, followed by U.S-Soviet negotiation of major reductions on both sides.

Haig called the idea "bad defense and security policy" as well as "bad arms control policy," and Richard R. Burt, director of politico-military affairs at the State Department, said it would put the United States "into a position of military disadvantage and dangerous vulnerability."

Hatfield and Kennedy charged the administration had been misleading in implying that their proposal applied only to land-based missiles in Europe, where the Soviet Union has a clear superiority. They said their resolution applies on a worldwide basis, where the United States has about 9,000 nuclear warheads and the Soviet Union some 7,000.

"Obviously Secretary Haig has chosen to count missiles in Europe rather than warheads worldwide," they said. "We challenge him to debate our freeze and reductions proposal fairly and honestly."