The invention relates to a two-chip type f Theta lens of a microcomputer electric laser scanning device, which is provided with a first lens and a second lens, wherein the first lens and the second lens both consist of crescent-shaped lenses with concaves positioned at the side of a microcomputer electric reflector. The first lens is provided with a first optical surface and a second optical surface which both mainly convert scanning beam optical spots in a nonlinear scanning relationship between an angle reflected by the microcomputer electric reflector and time into scanning beam optical spots in a linear scanning relationship between distance and time. The second lens is provided with a third optical surface and a fourth optical surface which both mainly modify and focus the scanning beam of the first lens on a target object. The first lens and the second lens both satisfy a specific optical condition, so that the effect of linear scanning and the purpose of high-resolution scanningcan be achieved by the arrangement of the first lens and the second lens.