The invention provides a track circuit for signal separation and an achieving method. The track circuit comprises a frequency shift dual-channel separation branch circuit and a pulse dual-channel separation branch circuit which are connected in parallel. The frequency shift dual-channel separation branch circuit comprises a series resonance circuit, and the pulse dual-channel separation branch circuit comprises a resistor-capacitor parallel circuit. The track circuit has the advantages that separation of two signals is performed through a method for performing simulation filtering in advance,the signal to noise ratio of signals can be greatly increased, and the probability of mistaken demodulation is greatly lowered.