The invention discloses an angle adjusting mechanism and a loudspeaker box having the angle adjusting mechanism, wherein the loudspeaker box having the angle adjusting mechanism includes an angle adjusting positioning mechanism, and a bottom cover. The angle adjusting mechanism includes a housing, a support rod sleeve, a support rod, a limiting mechanism, and an angle positioning mechanism, wherein the limiting mechanism includes a stop structure and a rotating structure; the angle positioning mechanism includes at least one snap-fit structure disposed on the sidewall, and at least one abutting structure; the snap-fit structure includes a plurality of trapezoidal slots, and the abutting structure includes at least one positioning strip; the positioning strip includes a trapezoidal table; and the trapezoidal table is inserted into one of the plurality of trapezoidal slots when the support rod is inserted into the support rod sleeve to position the relative position of the support rod sleeve and the housing. Since the angle adjusting mechanism has the angle positioning mechanism and the limiting mechanism, the loudspeaker box may rotate around the pivot of the housing to adjust the angle of the sound under the mutual cooperation of the housing, the support rod sleeve and the support rod.