The utility model relates to a scaffold connecting and fixing construction device. The scaffold connecting and fixing construction device comprises a left hydraulic device and a right hydraulic device, a left hydraulic telescopic column and a right hydraulic telescopic column are arranged at the upper portion of the left hydraulic device and the upper portion of the right hydraulic device respectively, a first supporting barrel and a second supporting barrel are arranged at the upper end of the left hydraulic telescopic column and the upper end of the right hydraulic telescopic column respectively, a lower supporting plate is arranged between the middle of the first supporting barrel and the middle of the second supporting barrel, a first supporting column and a second supporting column are arranged at the upper portion of the first supporting barrel and the upper portion of the second supporting barrel respectively, and a third supporting barrel and a fourth supporting barrel are arranged at the upper end of the first supporting column and the upper end of the second supporting column respectively. An upper supporting plate is arranged between the middle of the third supporting barrel and the middle of the fourth supporting barrel. Connecting and fixing can be carried out effectively for a scaffold and a supporting plate in a targeted mode, the supporting barrels, the supporting columns and the supporting plates can be supplemented constantly according to needs, materials can be conveniently conveyed from the lower position through pulleys, climbing is facilitated for a worker through a construction ladder, and the construction safety is improved.