The invention discloses an assembly-type ground leveling structure and an installing method, and particularly relates to the field of buildings. The assembly-type ground leveling structure comprises abottom plate, an adjusting screw rod, an assembly part keel positioning fixing nut, fixing square tube keel screws and an assembly supporting plate, the bottom plate is connected with the adjusting screw rod, and the assembly part keel positioning fixing nut is arranged on the adjusting screw rod. The installing method includes the following steps that A, the installing point and elevation of theground leveling structure are calibrated on the ground; B, the leveling structure is installed; C, the height of the assembly supporting plate is adjusted; D, keels are installed; E, the flatness ofan overall keel is adjusted; F, base layer plates are installed on the keels; G, finished product floors are laid on the base layer plates. With the assembly-type ground leveling structure and the installing method, construction speed is high, transportation costs are low, the leveling degree is high, adjusting is convenient, no deformation occurs, installing difficulty is low, and environmental pollution is small.