A robotised construction system is provided that includes a cartesian robot that can be automatically lifted as the construction is becoming higher, that is provided with a system of robotic supply of the materials and of the electric and electronic installations and that is provided with specific fabrication tools which work some by the contribution of layers of fluid construction materials. In a cement-based usage in which the cement is setting and having been deposited, by projection of these same materials and others by forming and placing construction elements in a determined position.