In a campaign outing in the South Island city on Sunday, leader Jacinda Ardern said the "capital acceleration facility" was the centrepiece of Labour's plan for the region.
The Government installed a commissioner and Environment Canterbury is still controlled by Government appointees.
"Labour is putting $300 million on the table, ready to be accessed for projects that will provide benefits for the city's future", Ms Ardern said in a statement this afternoon.
Last week, Prime Minister Bill English announced National would add a further $120 million to the $59 million already pledged for a stadium in Christchurch.
Another $3 billion or so has been earmarked for further investment in Canterbury.
"We'll negotiate a Global Settlement with the Christchurch City Council, settling the long-term ownership, opportunities and funding for the anchor projects - providing the certainty that residents, developers and investors need".
Speaking to a crowd of hundreds of her supporters at the Riccarton Racecourse, Ms Ardern also promised to fix the relationship with the Canterbury District Health Board, as part of a broader review of the DHB's funding model.
"Labour is committed to speeding up the rebuild, unlocking Canterbury's potential and healing the hurt that still, to this day, exists across mental health, education and insurance worries".
Labour would also establish a governance group to accelerate the rebuilding of Christchurch schools.