The invention relates to the technical field of glasses processing, and discloses an automatic segment cutting device for glasses arm frame processing. The automatic segment cutting device comprises ashell, an opening communicating with the interior of the shell is formed in the top of the shell, the opening is internally provided with a hydraulic pump, the surface of the hydraulic pump is connected with the interior of the opening in a clamped mode, a positioning cover is arranged on the outer surface of the hydraulic pump, the positioning cover is connected with the surface of the hydraulicpump in a clamped mode, and a clamping groove is formed in the top of the shell. According to the automatic segment cutting device for glasses arm frame processing, through arrangement of a supporting plate and a supporting pad, a to-be-segment-cut glasses arm frame is put aside conveniently, through mutual cooperation among a fixing block, a spring and a clamping cover, by using extrusion of thespring, the clamping cover is driven to clamp and locate the to-be-segment-cut glasses arm frame on the surface of the supporting pad, and the problems that materials of the glasses arm frame are notlocated in the segment cutting process of existing automatic segment cutting device for glasses arm frame processing, and consequently during segment cutting, deviation is prone to producing and damage is caused are solved.