More heads set to roll on gabfest as JULIE CHEN rules with an iron glove.

Show moderator Julie Chen – who was behind the firings of Leah Remini and Holly Robinson Peete – is already looking to dump comedian Sheryl Underwood…AND she can’t wait for “Saturday Night Live” alum Molly Shannon’s guest-hosting gig to end, The ENQUIRER has learned.

As The ENQUIRER first reported, Julie, 41, who’s married to CBS chief Les Moonves, rules the show with an iron fist.

“Julie believes they made a huge mistake by adding Sheryl to the panel,” a set insider confided. “She thinks Sheryl’s comedy is too crude for daytime TV.”

According to the insider, Julie was particularly upset when Sheryl made light of suicide during a discussion about the death of “Real Housewives of Beverly Hills” husband Russell Armstrong on the show’s premiere episode.

“Julie doesn’t mince words – she says Sheryl’s vulgar style isn’t a good fit.”

And she just doesn’t find Molly up to her “high standards” either, added the insider.

ALL the details are in the new ENQUIRER on sale now.