Police said they have registered cases against constable Sumathi and five others, including her colleagues, and were searching for them in connection with the incident at Vellakkal.
The woman suffered head injuries and had been hospitalised, they said.
Sumathi, attached to the Armed Police wing in Madurai, came to know about the illegal affair of her husband and along with her colleagues and some others barged into the house of the woman last night.
They smashed all the household goods besides assaulting the woman on her head.