Guild Executive Director Doug Allen said results of the mail-in poll justified the union's rejection of the studios' final offer for a contract covering film and prime-time TV productions.
"This clearly rebuts the management myth that our members were ready to accept their June 30 proposal. Clearly they're not," Allen said.
Actors have continued to work under the terms of a contract that expired June 30. The sides have been at loggerheads over how to handle productions made for the Internet.
The Alliance of Motion Picture and Television Producers said the union's 12 pages of information accompanying the survey were "hopelessly one-sided" and said the studios' final offer remained on the table.
About 10 percent of the 103,600 members who were sent the survey responded.
On Thursday, the guild is to announce the results of an election that could give an upstart group control of the guild's national board and potentially change the course of the negotiations.