The arrest of the 58-year-old mother-of-two, identified in media reports as Cheung Sau-kuen, comes just a week after thousands of domestic workers marched in the southern Chinese city to demand justice for an Indonesian maid allegedly assaulted by her employer.
The Bangladeshi helper, 27-year-old Akter Kalpona, accused Cheung of punching her in the head, pulling her hair, scratching her hands with a metal brush and confining her to a store room, The Standard newspaper reported.
The victim, who the police said was sent to hospital for treatment, claims her employer also prevented her from using ointment to treat her injuries.
The allegations come after another Hong Kong mother-of-two was arrested last week for allegedly assaulting her Indonesian maid, in a case that prompted thousands of outraged domestic helpers to rally in the streets.
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Law Wan-tung is accused of causing grievous bodily harm to Erwiana Sulistyaningsih with household items such as rulers, a clothes hangar and a mop, that she turned into "weapons".
Hong Kong is home to nearly 300,000 maids, mainly from Indonesia and the Philippines, and criticism from rights groups over their treatment is growing.
In September a Hong Kong couple were jailed for savagely beating their Indonesian domestic helper, including burning her with an iron and hitting her with a bicycle chain.
Amnesty International in November condemned the "slavery-like" conditions faced by thousands of Indonesian domestic helpers in Hong Kong and accused authorities of "inexcusable" inaction.