The utility model relates to photovoltaic support technical field discloses a section steel connecting structure, including C type steel subassembly and no
curling C type steel, C type steel subassembly includes first C type steel and second C type steel, the web of no
curling C type steel is set up with the
curling of first C type steel
adaptation's bayonet, the two flanges of no curling C type steel all are set up with the
flange of first C type steel
adaptation's first gap, the first C type steel is set up with the second gap of first gap one -to -one correspondence and the clamping cooperation, the curling of first C type steel includes the clamping portion between two first gaps, this clamping portion and bayonet clamping cooperation, first C type steel, second C type steel and no curling C type steel are connected through fastening
assembly. Through setting up with the bayonet and first gap of first C type steel
adaptation on no curling C type steel, cooperate corresponding second gap on first C type steel, form double positioning clamping structure, can promote the stability and
carrying capacity of section steel connecting structure.