The invention provides a box sealing mechanism for an electronic product packaging line, and belongs to the field of packaging equipment. The box sealing mechanism comprises a pressing assembly, a nailing machine, a fixing frame and an adhesive tape pasting assembly are sequentially arranged, wherein the adhesive tape pasting component comprises an adhesive tape coil, a guide plate, a primary pressing plate and a secondary pressing plate; and the adhesive tape coil is erected at the upper end of the fixing frame, one end of the adhesive tape coil is arranged at the upper end of the guide plate, the primary pressing plate and the guide plate are arranged in parallel, the primary pressing plate is arranged the one side, away from the adhesive tape coil, of the guide plate, and the secondarypressing plate is arranged at the rear end of the fixing frame. The box sealing mechanism has the advantage that the sealing performance of box sealing can be guaranteed.