The utility model provides a railway turnout positive and negative position detection device, which relates to the technical field of railway early warning, and comprises a shell, and a distance measuring
radar and a
signal detection board which are arranged in the shell, the shell is detachably arranged on a stock rail at a position 100-150mm away from a turnout tip or a turnout
tail, the distance measuring
radar is electrically connected with the
signal detection board, and the
signal detection board is electrically connected with the shell. The distance measuring
radar detects the distance between the turnout tip or the turnout
tail of the turnout and the stock rail and feeds back the distance to the signal detection board, and the forward and reverse positions of the turnout are accurately judged so as to determine the advancing direction of a
train. The distance measuring radar is used for detecting the position of the turnout in real time, the advancing direction of a
train can be accurately judged by combining with
processing of the signal detection board, whether the
train enters a crossing or not is pre-judged in advance, and the problems of false early warning of the crossing and insufficient early warning time are avoided. The method is especially suitable for the scene that the railway lines have branches or stations in the crossing early warning distance area of the railway crossing train approaching early warning equipment.