The invention provides a device used for machining a plate side face hole groove, and belongs to the technical field of automatic mechanical equipment. The technical problems that in the prior art, positioning machining is not efficient and accurate, stability is poor, and in the plate conveying process, wear is easily caused can be solved. The device comprises a rack, an input end is arranged atone end of the rack, an output end is arranged at the other end of the rack, and the device is characterized in that multiple work platforms are fixedly mounted on the rack, at least one set of working heads facing the work platform is mounted on one side of the rack, a set of rollers capable of lifting is arranged on the rack from the input end to the output end of the rack, a baffle which can lift and move towards the conveying direction of the rollers is arranged between the rollers, a mounting cross beam is fixedly mounted at the position, above the work heads, of the rack, and the mounting cross beam is provided with a driving part inclining downwards to face the side of the rack from the outer side of the rack. Timeliness and smoothness of loading and discharging can be ensured, themultiple work heads carry out machining at the same time, and machining efficiency is greatly improved.