The invention discloses a transmission method and system of inter-panel alarm information in IPRAN equipment, and relates to the field of IPRAN. The method comprises the steps that a master control panel sends out a poll frame, each circuit panel sends a response frame from the net frame when the corresponding circuit panel is called according to a poll command, when polling is conducted by the master control panel once, all the collected alarm information is broadcasted to all the circuit panels in a mode of a user-defined HDLC protocol frame, the user-defined HDLC protocol frame comprises a broadcast address, a control word, a calling address, data and a frame verifying field, the frame head and the frame tail are automatically recognized through signs, and the number and the lengths of the frames are changed by modifying parameters of a control portion. All the circuit panels receive information of the broadcasted user-defined HDLC protocol frame, and mutual transmission of all the inter-panel alarm information in a system is achieved. Under the precondition that hardware is not changed, free increase and decrease of the amount of the alarm information can be achieved, transmission is reliable, and test requirements of various operators are met.