The　poor　machinability　of　halide　perovskite　crystals　severely　hampered　their　practical　applications.　Here　a　high-throughput　growth　method　is　reported　for　armored　perovskite　single-crystal　fibers　(SCFs).　The　mold-embedded　melt　growth　(MEG)　method　provides　each　SCF　with　a　capillary　quartz　shell,　thus　guaranteeing　their　integrality　when　cutting　and　polishing.　Hundreds　of　perovskite　SCFs,　exemplified　by　CsPbBr3,　CsPbCl3,　and　CsPbBr2.5I0.5,　with　customized　dimensions　(inner　diameters　of　150–1000 µm　and　length　of　several　centimeters),　are　grown　in　one　batch,　with　all　the　SCFs　bearing　homogeneity　in　shape,　orientation,　and　optical/electronic　properties.　Versatile　assembly　protocols　are　proposed　to　directly　integrate　the　SCFs　into　arrays.　The　assembled　array　detectors　demonstrated　low-level　dark　currents　(＜　1 nA)　with　negligible　drift,　low　detection　limit　(＜　44.84 nGy s−1),　and　high　sensitivity　(61147 µC Gy−1 cm−2).　Moreover,　the　SCFs　as　isolated　pixels　are　free　of　signal　crosstalk　while　showing　uniform　X-ray　photocurrents,　which　is　in　favor　of　high　spatial　resolution　X-ray　imaging.　As　both　MEG　and　the　assembly　of　SCFs　involve　none　sophisticated　processes　limiting　the　scalable　fabrication,　the　strategy　is　considered　to　meet　the　preconditions　of　high-throughput　productions.　©　2024　Wiley-VCH　GmbH.