The invention discloses a method and a device for seawater desalination by comprehensively using solar energy. The device comprises a solar energy heat collector, a bubble evaporator, an air distributor, an induced fan, a condensing heat regenerator, a heat exchanging pipe, an air pump, a solar panel, a main controller, a salt water tank, a desalted water, four electromagnetic valves and three centrifugal pumps, wherein the solar energy heat collector absorbs the solar energy heating closed circulating water which enters the heat exchanging pipe to exchange heat with the seawater inside the bubble evaporator; wet gas is introduced into the bottom of the bubble evaporator by the air pump, the gas passes through high temperature seawater in the form of small bubbles from top to bottom through the air distributor, the temperature of air is increased, and the relative humidity is increased; the induced fan discharges high humidity air and forms negative pressure at the upper part of the liquid surface so that the partial pressure of the liquid phase is reduced; the high humidity air is discharged and enters the condensing heat regenerator to exchange heat with the low-temperature seawater, the water vapor forms desalted water after condensed, the air enters the bubble evaporator through the air pump, and the cold seawater absorbs the heat of the high humidity air and enters the bubble evaporator. The device has simple structure, saves energy and protects the environment.