The present invention proposes a chip eutectic welding method, comprising the following steps: step (a), determining the size of the L-shaped ceramic positioning fixture according to the size of the gasket; step (b), using a laser machine to cut the corresponding size L-shaped ceramic positioning fixture; step (c), in the process of positioning the chip, first adopt the L-shaped ceramic positioning fixture to fix the gasket, then put the soldering piece on the gasket, and finally put the chip on the soldering piece; step (d) After the chip is fixed by the positioning fixture, put it into the vacuum eutectic furnace and use the welding tool for eutectic welding. In the chip eutectic welding method of the present invention, the L-shaped ceramic positioning fixture is prepared by a laser machine, which effectively solves the problem of misalignment between the chip and the pad during eutectic welding. The method is simple, low in cost, and strong in feasibility; Ceramics are used as the base material, which can provide effective mechanical support and have a wide range of applications.