The invention discloses an adjustable conveying mechanism and belongs to the field of conveying mechanical equipment. The adjustable conveying mechanism comprises a fixed support, a rotary support, a conveying support and a rotation motor. The conveying support and the rotary support are sequentially and horizontally arranged on the upper side of the fixed support from top to bottom. The middle portion of the lower side of the rotary support is horizontally and rotatably connected with the fixed support. Thread surfaces opposite in screw direction are arranged on the two sides of a horizontal movement lead screw correspondingly. The horizontal movement lead screw is in threaded connection with horizontal movement blocks. The horizontal movement blocks can move horizontally along a lower horizontal movement guide rod. A conveying motor drives conveying rollers. Upper horizontal movement guide rods are horizontally arranged on the two sides of the conveying support correspondingly. The two sides of the upper horizontal movement guide rods are horizontally provided with horizontal movement sleeves correspondingly. Connecting plates are arranged between the horizontal movement sleeves and the horizontal movement blocks in a crossed mode. The middle portions of the two connecting plates are hinged to each other. The adjustable conveying mechanism is reasonable in structural design, a conveying belt can be adjusted rapidly, efficiently and conveniently according to conveying requirements, and the production and application requirements are met.