Frankfurt, who had Brazilian defender Tuta despatched off for a 2d reserving overdue on, took the lead while Ansgar Knauff hit the top corner with a curling lengthy-range shot simply after 1/2-time.
Barcelona had a permit off when referee Srdjan Jovanovic reversed his selection to award a penalty when captain Sergio Busquets brought down Rafael Borre.
However, Barcelona fought returned when Torres tapped in after combining with Frenkie de Jong within the 66th minute.
"To pass at the back of but come to be drawing may turn out to be a totally valuable result for the second one leg," stated Torres.
"Frankfurt have been hard - they made things tough. The essential thing turned into that we have been affected person and the praise changed into that we were given a good equaliser."
Torres' equaliser makes them favourites for the return leg at Camp Nou subsequent Thursday.
"We put in a high-quality performance and did not allow them tons in the complete ninety mins," stated Frankfurt scorer Knauff.
"It's nearly a bit worrying that we failed to maintain on for the win, however whatever is feasible for the second leg."
A promote-out domestic crowd of 48,000 created a rather-charged atmosphere.
It stimulated Frankfurt to create 18 pictures on aim, to Barcelona's seven.
