The invention discloses an anti-deformation floor. The anti-deformation floor comprises a first substrate layer and a second substrate layer which are disposed at a relative interval as well as a supporting part and a connecting assembly. The technical solution disclosed by the invention is characterized in that the connecting assembly and the supporting part are disposed between the first substrate layer and the second substrate layer; the connecting assembly is in a stretched state during installation, namely the connecting assembly has tension from both ends to the middle; and the connecting assembly is connected to the first substrate layer and the second substrate layer respectively. In this way, two ends of the connecting assembly generate the tension towards the middle to the firstsubstrate layer and the second substrate layer respectively, namely the connecting assembly can prevent the first substrate layer from bulging upwards and prevent the second substrate layer from sinking vertically. The supporting part is disposed between the first substrate layer and the second substrate layer, so downward sinking of the first substrate layer or upward raising of the second substrate layer can be prevented and thus floor deformation is prevented.