The invention discloses a mechanism capable of realizing mutual conversion between push force and pull force of force amplifying. The mechanism comprises an inner revolving drum; a plurality of balls are kept between a push rod and the inner spiral raceway of the inner revolving drum by using a retainer; when the push rod is pushed in forwards, the linear motion of the push rod is converted into the rotational motion of the inner revolving drum and an outer revolving drum; a plurality of balls are kept between the outer spiral raceway of the outer revolving drum and a pull rod also by using the retainer; the rotational motion of the outer revolving drum is converted into the retraction motion of the pull rod. The mechanism disclosed by the invention is capable of converting application directions of the forces and converting the push force into the pull force, and has the advantages that the structure is simple, a force amplifying effect is good, and maintenance is convenient.