The invention discloses an automatic tape feeding mechanism special for a material connecting machine. The automatic tape feeding mechanism comprises an installing support, a feeding roll, a collection roll, a feeding roller, a collection roller and a tape paper separating assembly. The feeding roll, the collection roll, the feeding roller, the collection roller and the tape separating assembly are installed on the installing support. The feeding roll provides special tape with tape paper, the special tape is conveyed to the tape paper separating assembly through the feeding roller, and the tape paper separating assembly separates the tape paper from the special tape. The special tape separated from the tape paper separating assembly is conveyed to the collection roll collecting the special tape through the collection roller. According to the automatic tape feeding mechanism, tape position information is transmitted to a driving mechanism through an optical fiber signal, rotation driving is achieved through the driving mechanism, and thus the purpose of precise and automatic feeding is achieved.