An Antrim goal fest shortly after half-time saw Cavan's hopes of victory implode at Kingspan Breffni Park.
However, Tipperary's 0-11 to 0-8 win over Offaly ensured that the Breffni men retained their Division 3 status.
The Saffrons crashed home a hat-trick of goals in a four-minute spell which left Cavan on the cusp of relegation. They trailed by 1-4 to 0-5 at the interval after Aodhan Gallagher's 14th-minute goal put the visitors on the front foot.
The hosts' soft centre was then ruthlessly exposed in a blistering period of play from Antrim.
James Loughry lashed home 40th and 41st-minute goals to put his side into a 3-4 to 0-6 lead and any lingering hope Cavan had was crushed in the 44th minute when Colm Duffin raised the green flag.
Antrim did themselves no favours thereafter when Martin Johnson saw red on the hour after an off-the-ball incident but, pointedly, the news drifting from Clonmel drew the biggest cheer of the day from the home crowd.
Man of the Match: J Loughry (Antrim)
scorers -- Antrim: J Loughry 2-2, C Duffin 1-1, A Gallagher 1-0, T McCann 0-2 (2f), S McDonagh 0-1. Cavan: M Dunne 0-7 (5f), S Gaffney, N McDermott, D Givney, P O'Reilly, D Reilly 0-1 each.
Antrim -- W McSorley 6; T Scullion 6, J Crozier 5, K O'Boyle 6; P Gallagher 6, M Johnson 6, D O'Hagan 6; S McDonagh 7, C Murray 7; T McCann 6, M Sweeney 7, J Loughry 9; C Duffin 8, A Gallagher 7, O Gallagher 6. Subs: K Brady 4 for Duffin (57), M Armstrong 4 for O Gallagher (65).
Cavan -- K Fannin 7; D Barkey 5, D Reilly 5, R Flanagan 5; D O'Dowd 4, P O'Reilly 5, R Maloney-Derham 4; D Givney 5, R Cullivan 6; N Smith 6, M McKeever 5, N Murray 4; B Fitzpatrick 4, N McDermott 5, M Dunne 7. Subs: S Jordan 4 for O'Dowd (39), D McKiernan 4 for Fitzpatrick (39), K Meehan 4 for N Murray (41), S Gaffney 5 for Maloney-Derham (54), B McKiernan 4 for Dunne (67).
Ref -- D Fahy (Longford).