In the hungarian criminal procedure, the preparatory trial is held in the second stage of the criminal procedure, after the investigation and following the accusation, but exactly before the trial. Its elemental purposes are to give a chance for the accused to make an agreement with the court about confessing their culpability and the crimes they committed, otherwise – as it is said in its name – is to give place for the accused and the prosecutor to participate in the preparation for the trial and the proofing before the Court. The general opinion is that both of the preparatory trials’ new functions are unprecedented innovations in the Hungarian criminal procedure. I studied approximately twelve relevant acts, starting with the first Hungarian criminal procedure code from 1896, to examine the history of this legal institute. On this basis I think we are safe to say that, the re-regulation of the preparatory trial brought a significant innovation in the Hungarian Criminal Procedure Code without nearly any history. However, it is important to mention, that – according to my recent researches –, in the older Criminal Procedure Codes  some special procedures or rules already appeared which’ had minor similarities to the functions of the preparatory trial today.