The utility model relates to the field of building -construction, concrete alarm device for the intraductal material height of control material. Low material level alarm device turns over the board including installing in what the intraductal level of material was placed, turns over the one end of board and connects the pivot, is connected the welt at material pipe and pivot contact point, installs ceramic bearing in the pivot that lies in material outside of tubes side, and ceramic bearing's the outside is connected and is touched the steel sheet, touches the one end that the steel sheet passes through horizontal pole connection reset spring, and reset spring's the spring fixed axle of other end link bit on the welt touches the below of steel sheet and install touch switch. According to the automatic silicon steel sheet leveling machine of the transformer. The utility model relates to an expect intraductal low material level alarm device, has avoided to survey the interior material height problem of buret often with the weight mode that the preparation is easy, and is easy and simple to handle, can normally work, can save a large amount of costs of labor and time cost in the aqueous medium.