The invention discloses a flexible mineral insulation fireproof pre-branched cable branching head production process. The process comprises the following steps of S1, making preparation before branching head crimping; S2, closely pressing a wire core joint; S3, wrapping a wire core joint; S4, wrapping a cable core; and S5, performing low-smoke no-halogen forming of a pre-branched head. The flexible mineral insulation fireproof pre-branched cable branching head production process has beneficial effects of simple production process, insulating performance, heat-insulating and fireproof performance, multilayer wrapping, excellent heat-insulating and fireproof effect, effective cable core punching prevention, and reliable insurance for conduction of a copper sheath.