The invention relates to an installation-firm intelligent 3D printer. The installation-firm intelligent 3D printer comprises a base, a fixing mechanism arranged on one side of the base, and a printing mechanism arranged above the base; the printing mechanism comprises a lifting mechanism, a support mechanism, a printing platform, a support plate, a material disc, a wire feeding pipe, a heating device and a printing nozzle; the lifting mechanism is in transmission connection with the support plate; the material disc is arranged above the support plate; the heating device is arranged below the support plate; and the material disc is connected with the heating device through the wire feeding pipe. Through each fixing unit, the installation-firm intelligent 3D printer is fixed on a tabletop, so that the printing failure due to wrong touch of the printer is prevented, and smooth 3D printing is guaranteed; and moreover, the angle of the printing platform is detected through a horizontal measuring mechanism, and a support unit is used for changing self length to adjust the angle of the printing platform to keep horizontal, so that slip of printed objects is prevented, and smooth printing is further guaranteed.