The invention discloses a self-stimulated Raman scattering laser of an In-Band pump, which comprises a laser pump source, a laser energy transfer optical fiber, a first planoconvex lens for collimation, a second planoconvex lens for focusing, a reflection mirror of a resonator cavity, a laser gain dielectric crystal, a laser output mirror and a laser collimating mirror which are sequentially arranged, wherein pump light outputted by the laser pump source is transmitted to the first planoconvex lens via the laser energy transfer optical fiber, collimated by the first planoconvex lens, focused by the second planoconvex lens and further focused on the end surface of the laser gain dielectric crystal, the laser gain dielectric crystal produces stimulated radiation after absorbing the pump light, when the radiation of fundamental frequency light in the resonator cavity exceeds the self-stimulated Raman scattering threshold of the laser gain dielectric crystal, the produced Raman laser is collimated and outputted by the laser collimating mirror. The self-stimulated Raman scattering laser can improve the self-stimulated Raman scattering conversion rate, eliminate the thermal relaxation process from the pump energy level to the laser energy level of electrons of the conventional pump way, improve the quantum efficiency, reduce the heat and increase the self-stimulated Raman scattering conversion rate.