Automobile circuit board and tin immersion treatment method thereof

The invention provides an automobile circuit board and a tin immersion processing method thereof. The tin immersion treatment method for the automobile circuit board comprises the following steps: carrying out photocuring operation on an ink layer on the circuit board to obtain a photocured circuit board; performing oil removal operation on the light-cured circuit board to obtain an oil-removed circuit board; performing micro-etching operation on the deoiled circuit board to obtain a micro-etched circuit board; performing preimpregnation operation on the micro-etched circuit board to obtain a preimpregnated circuit board; sequentially carrying out temperature adjustment operation and complex concentration adjustment operation on the tin melting liquid medicine, so that the temperature of the tin melting liquid medicine reaches 66-70 DEG C, and the concentration of the complex reaches 140-160 g/L; and putting the pre-impregnated circuit board into the adjusted chemical tin immersion liquid medicine to carry ou