The invention provides an automatic dress material folding machine. The automatic dress material folding machine comprises a panel, a position sensor, horizontal folding mechanisms, a vertical folding mechanism and a control system; a vertical folding groove is formed in the panel, and the horizontal folding mechanisms are fixed to the two sides of the panel; the vertical folding mechanism comprises a vertical insertion plate and a guide roller set, the vertical insertion plate is correspondingly arranged at the position, above the vertical folding groove, of the panel, and the guide roller set is fixed to the position, below the vertical folding groove, of the panel; the input end of the control system is connected with the output end of a position sensor, the output end of the control system is connected with the control ends of the horizontal folding mechanisms and the control end of the vertical folding mechanism, and the control system receives signals of the position sensor, starts to control the horizontal folding mechanisms to complete longitudinal folding of dress materials, and then controls the vertical folding mechanism to complete transverse folding of the dress materials. The automatic dress material folding machine is simple and rapid in folding movement, folding of the dress materials can be automatically and rapidly completed, and the time spent in the overall folding process is shorter than or equal to 8 minutes per piece. The labor cost is reduced. The automatic dress material folding machine is particularly suitable for folding the light, thin and soft dress materials.