The invention discloses a method for checking the integrity of object transmitted message, a relative device and a system, wherein the method comprises that A, a receiver receives an object transmitted message, and a plurality of discrete groups transmitted safely, according to the discrete values, obtaining check information, the receiver uses preset sequence rule generates a plurality of sequences via received the object message, and obtaining a plurality of discrete values according to discrete calculation method on the sequences, to obtain check information, B, the receiver judges if the two check information are same, when they are same, the received message is not modified, or else, the message is changed. The invention can protect the transmission integrity of object message, resolve compatibility and cost problems, and improve safety.