A video showed one of the MPs trying to climb over a stair banister, before being dragged out of the building.
Several MPs camped out at the TV office overnight, in protest against what they called the government's "slave laws".
New rules mean companies can demand up to 400 hours of overtime a year and delay payment for it for three years.
Hungary has seen five days of street protests against the reforms, with about 10,000 people rallying in Budapest on Sunday.
Such demonstrations are rare in Hungary, where Prime Minister Viktor Orban's policies enjoy widespread support, despite repeated condemnation from other EU nations.
The government says the labour reform will benefit workers as well as companies who need to fill a labour shortage.
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