The utility model provides an intelligent clarifier is used to train based on DSP belongs to train intelligent security field, including DSP main control unit, last signal detection module, full -automatic ventilation module, intelligent temperature control module and the man -machine communication modules of connecting of DSP main control unit, signal detection module includes smog concentration detector and temperature sensor, full -automatic ventilation module includes square wave controller, H bridge drive circuit and switched reluctance motor, intelligence temperature control module includes temperature settlement scope, electronic switching circuit and variable frequency air conditioner, man -machine communication modules includes LCD and on -off control key. The utility model discloses test result in the train railway carriage or compartment indicates that this design has higher practical value, and system control is stable, and it is accurate to detect data, can realize in the train railway carriage or compartment automatic ventilation and the frequency conversion temperature function of going up and down, and purification train railway carriage or compartment air improves passenger's environment of going by bus, is fit for using widely in every section train railway carriage or compartment.