The invention provides a suspension type pouring-leveling device in building operations and a pouring method, wherein the suspension type pouring-leveling device comprises a suspension assembly and a leveling assembly. The suspension assembly comprises a fixing device and a connecting bar; a first plane is arranged below the leveling assembly which is located below the connecting bar; the upper portion of the connecting bar is connected with the fixing device; the leveling assembly is hanged on a reserved steel bar by the fixing device, wherein the position of the reserved steel bar is higher than the floor elevation. The suspension type pouring-leveling device controls the flatness and thickness of the whole floor through the arrangement of the leveling assembly. The suspension type pouring-leveling device is easy to install, can be quickly removably after the concrete floor is plastified, and used repeatedly.