Underground calandria installing, positioning and anti-floating device

The utility model discloses a positioning anti-floating device for underground calandria installation. Comprising a calandria placed underground and formworks fixed through pouring, the opening end of the calandria is sleeved with a pipe pillow, and the formworks are fixed to the two sides of the calandria; the positioning anti-floating device comprises a connecting steel plate, a fixing screw rod, a nut and an anchor bolt; the length of the connecting steel plate is the same as the width between the outer sides of the two pouring fixing formworks, vertically-downward wing edges are arranged at the two ends of the connecting steel plate, and penetrating holes corresponding to the formworks are formed in the wing edges and used for connecting, positioning and fixing. The connecting steel plate is transversely provided with multiple groups of nuts, each nut is adjustably screwed with an anchor bolt, and the top end of the lower part of the anchor bolt is limited and fixed with the upper surface of a pipe pillow