Dong Lien, 34, became suspicious when husband Nghia Lien, 35, was spending too much time away from home.
She gathered together her three children, Hien, Dong, Vinh and her mother-in-law and followed them to his mistress' house .
The gang stormed in and found the pair fully-clothed sleeping together on a bed in Vinh Phuc province, Vietnam, on September 3 at around 8am, after a night shift at a nearby factory.
Dung dragged her love rival into the street and with her three children tore off the woman's clothes and cut her hair while the man's mother watched.
The alleged victim, who police named only as Mrs K, later ran back into her house before police arrived.
Officers said they had arrested the five women in the video and had passed the case to a senior police force.
Witness Tuyen Quang said: "No one interfered in the incident because the jealous people screamed so loud, no one knew what the wrong and they did not want to get involved.
"I just know that two people were sitting in the room, then the man's wife and relatives pulled her out, then they just hit, cut her hair, stripped the girl and abused her."
Police chief Nguyen Minh Thiet, head of public security in the Ba Hien Commune where the attack happened, said that police had started an investigation immediately after the incident.