Installable temporary modular floor designed to be arranged resting on a surface to be protected so as to temporarily cover/face said surface, said floor comprising: at least two square or rectangular panels, which are arranged side by side in adjacent positions and substantially coplanar to each other, and are provided on each of the four sides with at least one recess, which defines a seat with a corresponding recess made on one side of an adjacent panel, at least one connecting plate, which is designed to be engaged in said seat to mutual couple said panels, said connecting plate is shaped so as to be manually engaged in a stable, but easily removable manner, in said seat along a direction substantially orthogonal to the plane on which the panels lie and is provided with snap coupling members, which are designed to be operated, during engagement, to make a snap coupling between the connecting plate and said panels, said floor being characterized in that said connecting plate comprises: a rectangular-shaped flat sheet, which lies on the same lying plane as the panel so that the upper surface of the connecting plate is substantially coplanar with the upper surface of the panel forming the walkable surface of the floor, an external rectangular perimeter frame which surrounds an external perimeter edge of the rectangular-shaped flat sheet and overhangs a lower surface of the latter so that it is positioned substantially orthogonal to the rectangular-shaped flat sheet and is substantially arranged close to walls of the recesses that laterally delimit the rectangular seat with a lower edge resting/abutting on a bottom wall of the recesses forming the seat, said snap coupling members comprise two pairs of lateral teeth which protrude from outer surfaces of two parallel sides of the external rectangular perimeter frame of the connecting plate, and are designed for snap coupling to two corresponding pairs of openings made on the parallel walls of the seats, said two pairs of teeth being positioned on the respective larger sides opposite the connecting plate symmetrically to each other in relation to the longitudinal axis of the connecting plate, so that each tooth on a larger side is aligned with an opposite tooth on the other larger side, along a common axis orthogonal to the longitudinal axis. at least two square or rectangular panels, which are arranged side by side in adjacent positions and substantially coplanar to each other, and are provided on each of the four sides with at least one recess, which defines a seat with a corresponding recess made on one side of an adjacent panel, at least one connecting plate, which is designed to be engaged in said seat to mutual couple said panels, said connecting plate is shaped so as to be manually engaged in a stable, but easily removable manner, in said seat along a direction substantially orthogonal to the plane on which the panels lie and is provided with snap coupling members, which are designed to be operated, during engagement, to make a snap coupling between the connecting plate and said panels, a rectangular-shaped flat sheet, which lies on the same lying plane as the panel so that the upper surface of the connecting plate is substantially coplanar with the upper surface of the panel forming the walkable surface of the floor, an external rectangular perimeter frame which surrounds an external perimeter edge of the rectangular-shaped flat sheet and overhangs a lower surface of the latter so that it is positioned substantially orthogonal to the rectangular-shaped flat sheet and is substantially arranged close to walls of the recesses that laterally delimit the rectangular seat with a lower edge resting/abutting on a bottom wall of the recesses forming the seat, said snap coupling members comprise two pairs of lateral teeth which protrude from outer surfaces of two parallel sides of the external rectangular perimeter frame of the connecting plate, and are designed for snap coupling to two corresponding pairs of openings made on the parallel walls of the seats, said two pairs of teeth being positioned on the respective larger sides opposite the connecting plate symmetrically to each other in relation to the longitudinal axis of the connecting plate, so that each tooth on a larger side is aligned with an opposite tooth on the other larger side, along a common axis orthogonal to the longitudinal axis.