The invention discloses an automatic pre-baking system for lithium battery cells. The automatic pre-baking system comprises a feeding mechanical arm module, a pre-baking oven module and a discharging mechanical arm module. The feeding mechanical arm module and the discharging mechanical arm module are arranged at the two ends of the pre-baking oven module correspondingly. Conveying mechanism supports are further arranged between the feeding mechanical arm module and the pre-baking oven module and between the pre-baking oven module and the discharging mechanical arm module separately. A conveying assembly is arranged between the conveying mechanism supports and penetrates through the pre-baking oven module. The feeding mechanical arm module is used for putting the battery cells onto the conveying assembly. The conveying assembly conveys the battery cells into a pressure equalizing chamber of the pre-baking oven module from one end, and a drying assembly is arranged inside the pressure equalizing chamber. The battery cells are preheated and dried in the pressure equalizing chamber. The discharging mechanical arm module takes out the preheated and baked battery cells from the other end of the pre-baking oven module and puts the battery cells onto a material placing table assembly. By the aid of the automatic pre-baking system, the battery cells can be fed and discharged automatically, and thus the pre-baking curing process of the battery cells can be realized automatically.