The clip is said to be filmed by a young couple who witnessed the scene on October 10.
In the clip, the woman verbally abused two mobile policemen and then slapped them on their face.
She even threatened to sack those who attacked her.
However, the identity of the woman, policemen and the location are not known.
Recently, there have been many reports about such cop-beating cases in Vietnam.
Here is the clip capturing the confrontation:
Last August, a court in Ho Chi Minh City sentenced Pham Thi My Linh who is not yet a full 18 years old to nine months in prison for slapping an on-duty traffic policeman.
Earlier, the Binh Thanh District police in Ho Chi Minh City have recommended criminal charges against former officer Tran Dai Phuc for assaulting on-duty traffic cop Van Thanh Luan in July.
Two days before Phuc’s attack, 49-year-old Huynh Thanh Thang, the deputy head of the judicial section in Hau Giang Mekong Delta province, insulted and caused minor injuries to a traffic policeman on duty in Can Tho City after being caught speeding.
90 policemen have been killed and more than 1,000 others injured in the line of duty since 1998, Thanh Nien newspaper cited a source from the Ministry of Public Security.
A total of 254 cases of policemen being assaulted between 2007 and June 2011, including 125 involving traffic policemen have been reported, the newspaper cited statistics from Hanoi police.