Photovoltaic support system suitable for areas prone to subsidence and collapse

The invention discloses a photovoltaic support system suitable for areas prone to subsidence and collapse. The photovoltaic support system comprises a main beam structure, a stand column structure, purlin holder purlin assemblies and hoop and inclined strut assemblies. The main beam structure is composed of a plurality of main beams. The stand column structure is composed of a pluggable section stand column and a fixed end stand column, the lower portion of the fixed end stand column is buried in the cast-in-place pile foundation, and the lower portion of the pluggable section stand column isinserted in the fixed end stand column in a sleeved mode. The stand column structure is connected with the main beam through a connecting piece arranged at the top of the pluggable section stand column; the purlin holder purlin assembly is composed of a first angle steel purlin holder, a purlin and a second angle steel purlin holder; the first angle steel purlin holder is supported on the middle span main beam; every two