The embodiment of the present invention discloses a method, a device and a system for recognizing precision time protocol massages, which relates to the field of communication. The present invention is invented for shortening the time of network equipment recognizing precision time protocol massages. The method for recognizing precision time protocol massages is applied to a multi-label transmitting network, which comprises the following steps: the precision time protocol massages are captured; a label retaining layer carrying recognizing labels is added in a label zone of the precision time protocol massages; and the precision time protocol massages are transmitted. Another method for recognizing the precision time protocol massages is applied to a multi-label protocol transmitting network, which comprises the following steps: massages carrying the label retaining layer in the label zone are captured; the precision time protocol massages are recognized through recognizing labels in the retaining label layer; and the precision time protocol massages are transmitted. The present invention can be applied to transmit the precision time protocol massages.