The utility model provides an open-type curtain wall stainless steel decoration strip installing device. The device structurally comprises a top plate, a fixing block, a rotating connecting block and a decoration strip, wherein the top end of the fixing block is fixedly connected with the lower end of the top plate; the front side of the fixing block is hinged with the rotating connecting block; the lower part of the rotating connecting block is fixedly connected with the upper part of the decoration strip; an another decoration strip is arranged at the right side of the decoration strip; a bolt penetrates through through holes formed in the two decoration strips to fix the two decoration strips. Compared with the prior art, the open-type curtain wall stainless steel decoration strip installing device provided by the utility model has the advantages that the positional deviation of all sides of the decoration strip can be conveniently adjusted, the engineering quality is effectively guaranteed, the effect of the device is better than that in the prior art, in the meantime, the labour, the time and the cost are effectively saved and the engineering time is greatly shortened; moreover, the device further has the characteristics of reasonable design, simple structure, easiness in processing, convenience in use and the like; and therefore, the device has the very good use value.