The invention discloses a low frequency tuning antenna applicable to explosive detection, which comprises a high Q-value tuning circuit, an impedance matching circuit and a ringing signal suppression circuit. The high Q-value tuning circuit receives radio frequency pulse containing characteristic frequency of a sample to be tested and output from a high-power transmitter. The impedance matching circuit is used for turning complex impedance of the high Q-value tuning circuit into 50 ohm, and a phase is 0. The ringing signal suppression circuit has effects that when the transmitter works, Q value of the circuit is high, and the antenna ringing signal suppression circuit does not work; and when the transmitter stops working, the Q value of the circuit is low, and residual energy stored in an antenna coil is consumed as soon as possible through the antenna ringing signal suppression circuit. Therefore, time from closing the transmitter to opening a receiver is shortened, the Q value of the circuit is high during a nuclear quadrupole resonance (NQR) signal receiving period, and detecting sensitivity on weak NQR signals is improved, namely a process that the Q value of a resonance circuit becomes smaller then bigger in a detection process is required.