Several activists have been summoned to face charges under the lèse-majesté law, which carries a sentence of up to 15 years in prison for each count.
It is the first time in over two years that such charges have been filed.
Thailand has been rocked by student-led protests for months, with demonstrators demanding changes to the monarchy.
Protesters are also calling for constitutional reforms and the removal of the country's prime minister.
On Tuesday, a prominent student activist, 22-year-old Parit Chiwarak, said he had received a summons for lèse-majesté - among other charges - but that he was "not afraid".
"The ceiling has been broken. Nothing can contain us anymore," he tweeted, along with a photo of the summons.
At least six other key protest leaders, including human rights lawyer Anon Nampa and Panusaya Sithijirawattanakul, are expected to face the same charges, according to reports.
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The most feared law in Thailand is back in use, after a three-year break, reportedly ordered by King Vajiralongkorn.
Its revival follows increasingly outspoken criticism of the king by protesters, in chants, on stage, and in what for many Thais is shockingly vulgar graffiti. This is something very new in Thailand. Even in previous episodes of political unrest few dared to attack the monarchy. But this generation of activists insists that the spending and power of the king must be challenged.
They will now face a law which allows secret trials, and puts huge pressure on defendants to admit guilt to reduce the often draconian prison sentences. But it may prove less effective in suppressing anti-monarchy sentiment than in the past, now that scandalous reports about the royal family are circulated instantly on social media.
Its use may even be counterproductive, costing the Thai monarchy sympathy while it is engaged in a campaign to shore up support for the institution.
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