The invention belongs to the technical field of pulse power, and relates to a copper-titanium composite Tesla transformer primary coil. The aims of increasing the electrical strength and mechanical strength of the coil and reducing the weight of the coil are achieved. The coil is mainly characterized by being formed by compositing a copper plate (5) and a titanium plate (6), the copper plate (5) is located outside and have an electric conduction effect, and the titanium plate (6) is located inside and have an effect on increasing the electrical strength and mechanical strength. The Tesla transformer primary coil has the advantages of being high in electric strength, high in mechanical strength, light in weight and the like.