The Bees announced on their official website that the Broncos will have be able to play their home games at The Hive after their eight-year groundshare with rugby union side Harlequins at Twickenham Stoop came to an end in September.
The club were edging closer to administration, but the agreement, which runs until the 2015 season with the option of an extension, has secured their future.
Broncos chairman David Hughes said: "Our focus has always been to ensure we made the right decision going forward. Over the last 10 days, we have worked closely with the Rugby Football League and Barnet chairman, Tony Kleanthous, to avoid administration and secure the future of the Broncos.
"I believe this is the right decision, not only for the club, but also for the future of Rugby League in London. Many hours have been spent working to make sure the Broncos are positioned in an environment where they are best able to prepare and compete at the highest level.
"I'd like to thank Chief Executive, Gus Mackay and our staff for the long hours they've spent working to make sure the Broncos survived."
The Broncos will also be training at Barnet's former ground Underhill.