To provide a construction method for a decorative floor surface for spraying powders for coloring with excellent workability even if a scope of placing ready mixed concrete is extended over a wide scope.

In this construction method for the decorative floor surface, a plurality of stands 2 provided with a thin and long leg 2a on a floor substrate 1 are arranged at predetermined positions, a scaffold is constructed above the floor substrate 1 by constructing a scaffold board 3 between the stands 2, ready mixed concrete 4 is poured into the floor substrate 1, powders 5 for coloring are sprayed on a surface of the ready mixed concrete 4 not yet cured on the scaffold and are leveled, a form pressing panel 7 having recessed and projecting patterns is pressed against surfaces of the powders 5 for coloring, and molding by use of the other form pressing panel 7 is repeated while removing the scaffold composed of the stands 2 and the scaffold board 3 by using a rear surface of the form pressing panel 7 in a pressed condition as the next scaffold.