An adjustable fixture comprises a clamping board used to mount a workpiece thereon, a hollow telescopic sleeve, a latching assembly, a telescopic shaft, and a fastening seat. The clamping board is fastened to the telescopic sleeve. The telescopic sleeve slidably receives the telescopic shaft therein. The latching assembly is mounted on the telescopic shaft and resists an interior wall of the telescopic sleeve to position the telescopic shaft relative to the telescopic sleeve. The telescopic shaft is rotatably mounted on the fastening seat.