The invention discloses an ultrasonic crystal remover for removing calcium and magnesium crystals in a tunnel drainage pipe, relates to tunnel engineering, underground engineering and geotechnical engineering, and solves the problem of blockage for an orifice due to a high crystallization possibility of a drainage pipeline of a tunnel structure. The ultrasonic crystal remover comprises a rack assembly, a loading chassis located below the rack assembly, an ultrasonic generator located above the rack assembly, an ultrasonic energy converter located above the rack assembly, an ultrasonic signal transmission cable used for connecting the ultrasonic generator with the ultrasonic energy converter, and an anisotropic telescopic probe head structure, wherein the anisotropic telescopic probe head structure comprises a probe fixing part, and a probe bending part located at a front end of the probe fixing part. With the adoption of the anisotropic telescopic probe head structure, crystallization of the orifice of the drainage pipeline of the tunnel structure is prevented, and blockage is avoided. The invention further discloses a use method for the ultrasonic crystal remover for removing calcium and magnesium crystals in the tunnel drainage pipe.