The invention relates to a supporting platform device for loading and unloading and a working method of the supporting platform device. The supporting platform device for loading and unloading comprises a moving platform (1), a plurality of distance detecting parts and an adjusting mechanism; the moving platform (1) is used for placing a containing body for containing articles to be loaded and unloaded; the distance detecting parts are arranged in the circumferential direction of the moving platform (1) and used for obtaining the distance between each distance detecting part and the containingbody; and the adjusting mechanism is used for adjusting the pose of the moving platform (1) according to the distance between the distance detecting parts and the containing body, so that the containing body is positioned to a target position suitable for working of loading and unloading equipment (11). According to the supporting platform device, the containing body can be accurately positionedto the target position suitable for working of the loading and unloading equipment so that the loading and unloading equipment can carry out loading and unloading in the containing body more smoothly,the operation angle is better, the operation efficiency is improved, and the articles can be orderly stacked; and the loading and unloading equipment can enter the containing body smoothly, so that the reliability and safety of the whole loading and unloading process are improved.