The present invention provides an ancillary additive manufacturing system for manufacturing a reconstructed model simultaneously during the oral surgery to effectively reduce the time and healthcare human resources for the oral surgery. The ancillary additive manufacturing system comprises an input device and a printing body. The printing body is connected to the input device and comprises a base, an ink-manufacturing module, an inkjet head controlling unit, and multiple inkjet heads. The ink-manufacturing module is located above the base and comprises first, second, and third ink-manufacturing units. The inkjet head controlling unit is located above the base. The inkjet heads are mounted to the inkjet head controlling unit and point toward the base and comprise a first, second, and third inkjet head. The first, second, and third inkjet head correspondingly connected to the first, second, and third ink-manufacturing units.