A foldable storage box, comprising: a bottom panel, a first mounting assembly, a second mounting assembly. The bottom panel with two opposite first edges and two opposite second edges; the first mounting assembly comprises two first side plates rotatably connected to the first edges respectively, and two ends of the first side plate close to the second edge are both provided with a first clamping structure; the second mounting assembly comprises two second side plates rotatably connected to the second edges respectively, and two ends of the second side plates close to the first edge are both provided with a second clamping structure capable of a snap fit to the first clamping structure.