The invention relates to an optical device, electronic equipment using the optical device and a control method thereof. The optical device comprises a first optical source unit for emitting an initial light; a first beam-splitting unit arranged in an irradiation region of the initial light and used for acquiring a first reflected light with a first polarization direction based on the initial light; a micro-electro-mechanical unit arranged in the irradiation region of the first reflected light and used for converting the first reflected light with the first polarization direction into a second reflected light with a second polarization direction on the reflecting surface, wherein the second reflected light transmits the first beam-splitting unit to be the first transmission light; the micro-electro-mechanical unit is used for controlling the spatial orientation of the reflecting surface so as to change an emergent direction of the first transmission light; an image acquiring unit for acquiring a first image corresponding to an operator through the third reflected light reflected by the operator based on the first transmission light.