They demand the prime minister release jailed opposition leader Kem Sokha and reinstate the Cambodia National Rescue Party
But observers say it is highly unlikely that the ruling will be overturned by the pliant court.
The government says the move will not influence Cambodia’s internal affairs.
He says Cambodia is still a multi-party democracy, although he no longer faces political competition.
Meanwhile, villagers say they lack representation after CNRP officials are removed.
The 158 MPs say his continued detention risks throwing the legitimacy of upcoming elections into question.
They say workers will suffer if they lose jobs in the garment and footwear industry, the backbone of the country’s economy.