The invention relates to a multi-parameter synchronous test experimental device for coordinated exploitation of an open-pit mine and an underground mine. The experimental device comprises a recording device and an industrial control machine which are electrically connected. The device is characterized in that the recording device is further electrically connected with a stress testing system, a displacement testing system and a fast camera shooting system, wherein the stress testing system is electrically connected with a plurality of stress sensors, the displacement testing system corresponds to a plurality of optical displacement measuring points, and the fast camera shooting system corresponds to a plurality of deformation tracking measuring points. According to the invention, simulation of separate exploitation of the underground mine, separate exploitation of the open-pit mine and combined exploitation of the open-pit mine and the underground mine are realized on the slope model of a coal lithological soil material; the parameters of stress, optical displacement and deformation are acquired in virtue of the stress testing system, the displacement testing system and the fast camera shooting system, programmed on the industrial control machine and analyzed; reasonable stop line positions of the underground mine and a coordinated advancing scheme of the open-pit mine are given, and bases for guiding decisions on coordinated exploitation security of the open-pit mine are provided.