Lucas Melano netted in the 12th minute for the visitors and Guido Carrillo levelled a minute into the second period.
The draw leaves Belgrano with 23 points, enough to put them into continental competition for the first time.
Relegated Independiente bowed out from the top flight with a 1-1 draw at Colon Santa Fe.
Lucas Mugni's own goal in the 21st minute put Independiente ahead, but Emmanuel Gigliotti equalised nine minutes from the break.
Quilmes celebrated their top-flight survival with a 3-2 win at Tigre.
Alejandro Donatti put Tigre ahead in the sixth minute but Quilmes, whose survival was confirmed in the last round of fixtures, turned the match around with goals from Sebastian Romero (eight) and Martin Cauteruccio (17).
Angel Diaz levelled five minutes before the break but Miguel Caneo netted the decider eight minutes after the restart.