In a report called "My sleep is my break: Exploitation of domestic labour in Qatar", Amnesty spoke of "shocking testimonies of violent abuse".
It said some of the women reported being "slapped, pulled by the hair, poked in the eyes, and kicked down the stairs by their employers" and that three said they were raped.
Amnesty urged Qatar "to urgently remove provisions in the labour law which deny labour rights to domestic and other workers".
Qatar has been under mounting pressure to improve the working and living conditions of migrant workers building the multi-billion-dollar infrastructure for the FIFA World Cup which it is to host in 2022.
Promises by Qatari authorities to address the issue have amounted to nothing, Amnesty said.
"Qatar must stop dragging its feet over this and guarantee domestic workers legal protection for basic rights immediately."
Amnesty's Global Issues Director Audrey Gaughran said "migrant domestic workers are victims of a discriminatory system that denies them basic protections and leaves them open to exploitation and abuse including forced labour and human trafficking."
"We have spoken to women who have been terribly deceived, then found themselves trapped and at the mercy of abusive employers, banned from leaving the house. Some women said they were threatened with physical violence when they told their employers they wanted to leave."
Some have told Amnesty researchers they work "up to 100 hours a week with no day off".
"Under Qatari law there are no limits on working hours for domestic workers and there is no requirement to give them a day off. They are also unable to lodge a complaint with the Labour Ministry," it added.
Those who complain "face major obstacles to getting justice" while their employers frequently escape prosecution and conviction, said Amnesty.
Domestic workers who try to flee "will be branded 'runaways' and are likely to end up being detained and deported," said Gaughran.
