Spherical support leveling device and support mounting and leveling method

The invention belongs to the field of infrastructures, and particularly relates to a spherical support leveling device and a support mounting and leveling method. The elevation and the level of the pre-embedded steel plate under the support are adjusted by adjusting the height of the bolt, so that the accuracy is high, errors caused by uncertain factors are avoided, and the installation quality of the support is improved; the elevation and levelness are adjusted through the adjusting bolts, so that operation is easy and convenient, parts of construction steps are omitted, the construction progress is accelerated, and the support installation efficiency is remarkably improved; the support pad stone is poured in two steps, wherein in the second step, gaps are filled through the high fluidity of grouting materials, so that the situation that hollowing possibly occurs below a lower embedded steel plate of the support due to one-time pouring is avoided, the construction quality of the support pad stone is improved