The utility model discloses a construction safety scaffold connecting device, include: first connecting portion and second connecting portion, these first connecting portion include two the first semicircular cylinder and the second semicircular cylinders that center on into the drum, and these second connecting portion include two the third semicircular cylinder and the fourth semicircular cylinders that center on into the drum, and half cylinder outer wall central authorities of this third are equipped with the spliced pole, and this spliced pole top outer wall is equipped with the circumference arch, is equipped with the through -hole in the middle of this second semicircular cylinder, and the spliced pole inserts the through -hole to the circumferential groove that the joint was established at this through -hole inner wall. Therefore, the utility model provides a construction safety scaffold connecting device is through setting up first connecting portion and the second connecting portion that installation angle can adjust to can realize the installation of building support's multi -angle, and wherein one side of first connecting portion and second connecting portion makes this connecting device become a whole, convenient operation through articulated.