The invention discloses a method for achieving data transmission of a power consumption information collecting system in a data link layer. The methods comprises converting data sent by a concentrator and data sent by a collector into the frames of the data link layer through a head end module and a terminal module respectively, therefore, data between the head end module and the terminal module are transmitted on the basis of a data link layer protocol. The method for achieving the data transmission of the power consumption information collecting system in the data link layer has the advantages of being capable of guaranteeing a high collecting success rate under a poor channel quality, improving the flexibility of the system, reducing the complexity of the system and improving the stability of the system.