Taweesak Kerdpoka, a reporter with an online news agency, was arrested in Ratchaburi province along with three activists belonging to anti-junta New Democracy Movement.
Two media organisations called on concerned authorities to drop the draconian charges banning criticism of the charter and release the reporter who has been accused of violating the ban on campaigning against the draft charter.
The offence carries a penalty of 10 years' imprisonment.
The police arrested the reporter who was in a pick up truck with the three activists. The police found some leaflets containing message against the draft.
Taweesak was in the vehicle with the activists only for a ride back to Bangkok, said the news agency's director Chiranuch Premchaiporn.
The latest arrests followed the release last week by a military court of seven activists detained in June for campaigning against the charter.
The August 7 referendum will be the first time Thais go to the polls since the military coup in May 2014.
The junta has said the referendum will pave the way for an election next year.
Critics, including major political parties, say the constitution will enshrine a political role for the military and weaken civilian governments, worsening the turmoil that has hit Thai politics over the last decade.
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