The invention discloses a high-speed tunnel for the reading and mass encoding of RFID labels contained in a package, integrated in a housing with respective counterposed inlet and outlet orifices, and in the interior whereof a transport means is established, by means of which the package is displaced; likewise one or more high-power antennas for the measurement of RFID labels and a photocell for the detection of the entry of packages into the tunnel; these elements being controlled by means of a control unit associated with an electrical switchboard. A number of guillotine doors or box doors in the tunnel enable the rapid identification and encoding of the labels of the elements present in a package by means of RFID technology, yielding a device of reduced dimensions.