Photovoltaic support system suitable for areas prone to sinking and collapsing

The utility model discloses a photovoltaic support system suitable for areas easy to sink and collapse. The photovoltaic support system comprises a main beam structure, a stand column structure, a purlin support purline assembly and a hoop and diagonal bracing assembly. 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 into 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 support purlin assembly is composed of a first angle steel purlin support, a purlin and a second angle steel purlin support. The first angle steel purlin support is supported on the middle span main beam; eve