The invention discloses a method for preparing a titanium carbonitride metal ceramic composite coating based on electric spark deposition. According to the technical scheme, the method includes the following steps that firstly, the surface of a base body is polished, surface oxide or foreign matter is removed, cleaning is conducted, surface oil dirt is removed, and then drying is conducted; secondly, a base coating is deposited, wherein the base coating is prepared on the surface of the base body through an electric spark deposition technology, and the material of an electrode adopted in the electric spark deposition technology is one of Ni, Mo, Nb and Zr; and thirdly, a Ti(C,N) metal ceramic coating is deposited, the electric spark deposition technology is adopted for depositing the Ti(C,N) metal ceramic coating on the surface of the machined base body, in the step, Ti(C,N) base metal ceramic is selected as the electrode in the electric spark deposition technology, and raw materials of the Ti(C,N) base metal ceramic include, by weight, 50%-65% of Ti(C,N), 10% of WC, 5-20% of Mo2C, 10% of Co and 10% of Ni.