A bidirectional access portable flash drive includes a casing, which defines therein a receiving space that receives a circuit board mounted therein. The circuit board has a surface on which a memory unit is mounted. The casing has an end to which a double-side pluggable micro-USB connector is mounted. The double-side pluggable micro-USB connector includes a frame and a plate mounted at a predetermined location in the frame. The plate has two surfaces each including a plurality of conductor elements mounted thereon. The plate has two ends at which at least one fixing element is mounted. The memory unit enables effective access and storage of data and the double-side pluggable micro-USB connector provides functions of double-side plugging and protection to achieve an effect of convenient transmission, access, and use of data.