The invention discloses a micro-jetting bonding forming method of a ceramic mould core blank, and belongs to the technical field of rapid manufacturing. The micro-jetting bonding forming method comprises the following steps: (1) according to the outline size of a ceramic mould core to be formed, performing three-dimensional modeling on the ceramic mould core, and slicing a three-dimensional model layer by layer by using slicing software to obtain a layer-by-layer splicing manufacturing instruction; (2) laying a ceramic powder base material; (3) jetting nano-sized dispersion liquid by using a spray head so as to bond a ceramic powder base material layer into a current layer outline; (4) after forming the current layer outline, moving down a powder bed in the Z-axis direction by a layer thickness; (5) sequentially repeating the step (2) to the step (4) until an initial ceramic mould core blank is formed; (6) leaving to stand to dry and cure the initial ceramic mould core blank obtained in the step (5) so as to obtain the ceramic mould core blank. By the micro-jetting bonding forming method, the problems that in the present micro-jetting bonding forming process, the ceramic blank is low in intensity, large in sintering deformation and low in forming accuracy are solved.