The invention provides a safe heating method for a color-coating line paint curing oven. The method adopts a double safe operation mode for the simultaneous control of the blast volume for safely discharging waste gas with rich solvent in a curing oven and the content of oxygen in the curing oven; a fan with the safe blast volume pumps out the waste gas in the curing oven to ensure that the content of the organic solvent in the curing oven is lower than one fourth of the lower explosive limit, so the explosion can be avoided no matter what content of the oxygen in the curing oven is; the waste gas is completely incinerated and pyrolyzed in an incinerator for removing the poisonous organic matter in the waste gas, and the content of remained oxygen in the gas after combustion is controlledunder 5 percent during incineration, so explosion is avoided again because the content of the organic solvent is always out of the explosion range due to the shortage of oxygen gas no matter how partial organic solvent changes; and the high-temperature waste gas is directly delivered back to the curing oven after utilized through a plurality of heat exchangers, so that the content of oxygen in the curing oven is controlled. The invention not only solves the problem of environment pollution but also can fully utilize energy to solve the problem of heat source supply in color-coating line production.