The invention discloses a manufacturing method of SiC-SiBCN nucleated glass. The manufacturing method comprises the following steps: using methyl benzene and sodium to prepare anhydrous methyl benzene, and respectively admixing PCS and PBS with the anhydrous methyl benzene to obtain a PCS methyl benzene solution and a PBS methyl benzene solution; and then adopting a process of vacuum solidification and then performing in-atmosphere pyrolysis to process a ceramic precursor polymer alloy obtained by mixing the PCS methyl benzene solution and the PBS methyl benzene solution of different proportions to obtain the SiC-SiBCN nucleated glass which can be stably used at 1400-1600 DEG C. SiC grains in the prepared SiC-SiBCN nucleated glass are dispersively distributed in the amorphous phase of SiBCN, wherein the SiC grains are obtained by the devitrification of the PCS micro zone in the condensate, and the SiBCN high-covalent bond amorphous phase is obtained after the pyrolysis of the PBS zone.