Automobile turning sheath sealing test device and test method

The invention aims to provide an automobile turning sheath sealing test device and test method, provides design verification for development of a turning sheath, and saves time for design optimization of the turning sheath, provides the turning sheath with excellent performance before entrucking and satisfies integral vehicle NVH requirements. The device comprises a simulation front screen, a damping pad, a sound insulation board, a sound wave emitter and a sound wave signal receiving and analyzing device, wherein the sound wave emitter and the sound wave signal receiving and analyzing device are respectively arranged at two sides of the sound insulation board, the simulation front screen and the damping pad are bond to form a turning sheath mounting board, the turning sheath mounting board is provided with a turning column through hole used for mounting a to-be-tested turning sheath, the sound insulation board is provided with a mounting hole of which profile is smaller than the turning sheath mounting board