The utility model discloses a powder box, which aims to provide a simple, convenient and stable chip mounting method. The powder box comprises a housing, a developing imaging component mounted on the housing, a chip, and a chip positioning and fixing structural device; a concave groove is formed on the side wall of the housing; the chip is mounted in the concave groove and fixed in a preset position through the chip positioning and fixing structural device; and when the chip with the quality problem is required to be replaced, the powder box avoids the possibility that other components of the powder box are damaged without disassembling the housing, so that the manufacture and recycling are simpler and more convenient. The utility model has the advantages that the chip is accurately positioned and has low probability of dropping off after being fixed; and the chip is protected by the housing and has low probability of being damaged.