The invention discloses a safe stopping device of a building construction material elevator. The safe stopping device comprises a fixed seat. The bottom of the fixed seat is fixedly connected with supporting legs. The center of the lower surface of the fixed seat is fixedly connected with a fixed pile. Extending-retracting rods and fixed rods are movably installed on the top of the fixed seat. The top ends of the extending-retracting rods and the fixed rods are movably connected with the bottom of a clamping plate. In the safe stopping device, the ground is perforated and excavated through the fixed pile, and fixing is achieved through the supporting legs; the extending-retracting rods are matched with the fixed rods to extend and stretch, so that the inclining angle of the clamping plate is adjusted, the inclining angle of the clamping plate is matched with the angle of the elevator, and accordingly the clamping plate and the elevator are connected more closely; and the overall stability of the elevator is improved, the height and the angle are convenient to adjust, and the safe stopping device is applicable to the elevators of different sizes and applicable to the elevators in various states in use and is high in applicability.