Abstract: The development of solar tracking technology to promote solar energy utilization is significance. An ingenious mechanism of cam plunger with single drive, dual-axis tracking function for solar tracking was designed in the paper, which achieved tracking solar azimuth and altitude angle at same time by a single driver. Design of solar tracking device was completed using the following methods: exhaustively method was used for determination of device structure size, solar altitude angle data points of per day during one year were calculated by using Matlab, cam contour was simulated by COSMOSMotion software with altitude angel data points inputs, the solid modeling of solar tracking device was completed by application Solidworks. By comparison position of solar altitude angle with practical test of prototype and theory computation, error precision of tracking device was within 7%. Compared with other similar products, the tracking device has features of low energy consumption, high reliability, strong anti-interference ability and easy maintenance and is applicable to various small civilian solar devices.