The utility model relates to the technical field of curtain wall opening sash installation. The utility model relates to a temporary fixing device, in particular to an adjustable curtain wall openingsash temporary fixing device. The fixing device comprises a fixing plate transversely fixed to an auxiliary frame of the curtain wall opening sash. The guide plates are longitudinally arranged on thefixed plate in parallel; a positioning plate is arranged on the guide plate; a slider is arranged at the bottom of the positioning plate; a groove is formed in the guide plate; a sliding rail is arranged in the groove; a plurality of limiting plates are arranged on one side of the sliding rail at intervals; an adjusting device is arranged on the positioning plate; the adjusting device comprises arotating shaft which transversely penetrates through the positioning plate; the hook body is arranged on the rotating shaft; a receding groove is formed in the positioning plate above the hook body; the curtain wall opening sash is simple in structure, convenient to operate, capable of replacing the installation mode that a worker holds the curtain wall opening sash by hand, free of potential safety hazards, capable of avoiding the defects that the curtain wall opening sash is not parallel to a sash frame, large in installation gap and poor in sealing effect, capable of facilitating fine adjustment of small intervals, capable of meeting different fixing positions and capable of effectively improving the construction quality and the construction efficiency.