The utility model relates to a square installation measurement bay, including main body frame, reinforcement angle steel and measuring stick, wherein, main body frame sets up to the rectangle frame, two bases extensions of this rectangle frame to guarantee the stability of frame, consolidate each middle welded fastening of the upper and lower left and right sides of angle steel and main body frame, wherein the welding is encrypted to the upper surface for the survey crew is stood, the measuring stick sets up on two angle points of upper surface of main body frame, has the scale on the measuring stick, can make things convenient for RTK or total powerstation to measure. Main body frame's size sets up as and conforms with the size of square. The utility model discloses a device can satisfy RTK simultaneously and the total powerstation uses, and the installation effectiveness increases substantially, the measurement bay precision is high, and stability is strong, is difficult for receiving the stormy waves to influence, has guaranteed square installation quality and efficiency.