Ed Miliband is describing how to move from the "casino banking we have to the stewardship banking we need".
He said banks no longer care about the success of the firms they lend to because they are too concerned with making an "immediate return".
He said banks should have a "fundamental duty to serve the real economy".
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It comes as 22 charities signed an open letter vowing to improve safeguarding, and apologising for 'failures' in the sector.
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Two-year-old Casper Platt-May and his six-year-old brother Corey died in the crash in Coventry on Thursday.