The invention relates to a coulomb damper, belonging to the technical field of damping vibration absorbers. The coulomb damper comprises a housing seat, wherein a pair of frustum mounting seats is mounted in the housing seat; damping pairs are mounted in tapered holes of the frustum mounting seats; center shafts penetrate through the centers of the damping pairs; the two frustum mounting seats are mounted in an inner hole of the housing seat with the large ends of the tapered holes opposite to each other; an adjustment interval is reserved in the inner hole; damping pressure springs are mounted between the two pairs of damping pairs; the housing seat consists of an upper housing, a lower housing and a ball seat; the upper housing and the lower housing are provided with inner ball concaves; a spherical hinge structure is formed by the upper housing, the lower housing and the ball seat; and a ball seat center penetrable hole is provided with adjustment threads for mounting the frusta mounting seats. The coulomb damper completely eliminates damping waves and has ideal following character; the phenomenon of dead lock is avoided; and the axial size of the coulomb damper is significantly reduced; the structure is very compact; and the operation is very convenient.