The invention discloses a half-duplex communication data transmission and confirmation method based on a 39-ary compression algorithm, and the method comprises the steps: enabling a system server to carry out the group transmission of compressed data, enabling a terminal to receive issued data, carrying out the message reminding after the data is received, and enabling the reminding information tobe replied. In the half-duplex communication system, the data is compressed before the data is issued, and a new message reminding mechanism and a new data reply mechanism are set, so that the utilization rate of communication channel resources is improved, and the system and the terminal can effectively guarantee the success rate of data issuing and confirmation on the basis of simultaneous voice and data transmission functions.