The invention discloses a relay protection pressing plate splicing identification method and system and a medium. The pressing plate splicing identification method comprises the following steps: identifying primary identification data and initialization data of an original image; intercepting plane coordinate data of the upper left corner of the pressing plate in the initialized data to perform row and column division; drawing upper, middle and lower character rectangular frames of the pressing plate; intercepting character data in the primary identification data and putting the character datainto a corresponding rectangular frame; combining the characters in the rectangular frame to obtain upper, middle and lower characters of the pressing plate in the photo; matching the upper, middle and lower characters of all the pressing plates with a standard library to obtain effective data of the pressing plates; and finally, selectively splicing to obtain the data of the pressing plate in the screen cabinet. According to the invention, synchronous matching photographing identification of the pressing plate and the characters can be realized, the work of manually checking the state of thepressing plate, the label characters and the position of the pressing plate in a screen cabinet is avoided, the work is completed by a computer, and the efficiency of pressing plate inspection, pressing plate acceptance and pressing plate inspection can be greatly improved.