The invention provides a wheeled transport cart convenient to use and rapid and convenient to stretch and retract. The wheeled transport cart comprises two load-bearing seats, two wheel placement mechanisms, a retractable auxiliary mechanism, a plurality of first rollers and a plurality of second rollers, wherein the two wheel placement mechanisms are in one-to-one correspondence to the two load-bearing seats; each wheel placement mechanism comprises a first positioning plate, a second positioning plate, a plurality of carrying plates, a plurality of clamping plates and a plurality of movable plates; the retractable auxiliary mechanism comprises a mounting rack, a rotating barrel and a screw; second ends of the movable plates are connected with the mounting rack; the rotating barrel is rotatably mounted on the mounting rack; the screw is mounted on the rotating barrel; an inner treaded hole is formed in each load-bearing seat; two ends of the screw are respectively connected with the two load-bearing seats through inner threaded holes; and the first rollers and the second rollers are respectively mounted on the lower parts of the two load-bearing seats. The wheeled transport cart is simple in structure and convenient to use; and the article supporting effect is excellent.