The invention discloses a light field display device and method, and the device comprises an image source which generates light representing virtual information; a mixing module which enables the light of the virtual information and external environment light to pass through the mixing module and a transmitting type spatial modulator to enter human eyes; the transmitting type spatial modulator which carries out the modulation of the light of the virtual information and external environment light according to a control signal of a control module; and the control module which synchronously controls the transmitting type spatial modulator and the image source, enables different independent units of the transmitting type spatial modulator to be opened or closed in an ordered manner, and enables the image source to display corresponding images in an ordered manner. The method comprises the step: quickly opening or closing different independent units in an ordered manner through the transmitting type spatial modulator, and building a simulation light field for to-be-represented virtual information. When a user see the to-be-represented virtual information through the simulation light field, there is no convergence adjustment conflicts, thereby avoiding the fatigue of human eyes and other physiological discomfort.