Integrated whitening and desulfurizing device, the device comprises a flue gas cooler, a desulfurizing tower, a flue gas condenser, a cooling tower and a flue gas heater, flue gas entering flue gas cooler, the flue gas cooler is communicated with the desulfurizing tower through a flue; a desulfurization spraying layer is arranged in the desulfurization tower; a desulfurization demister is arrangedabove the desulfurization spraying layer, a flue gas condenser is arranged above the desulfurization demister, the flue gas condenser is connected with the cooling tower through a cooling water circulating pump circulating pipeline, a demisting component for collecting condensate water is arranged above the flue gas condenser, a flue gas heater is arranged above the demisting component, and fluegas is discharged after passing through the flue gas heater. And a demisting part is added after condensation, so that water condensed by the flue gas condenser is prevented from being carried to theflue gas heater for the second time to influence the heating effect or demisting effect. And the flue gas condenser and the flue gas heater are arranged in the absorption tower in a modular manner, sothat the field installation requirement and the attractiveness are ensured. The problem of shortage of arrangement space in a plant area is effectively solved, and the problems of high manufacturingcost and poor heat exchange effect caused by introduction of other plant areas for solving the problem of arrangement space are avoided.