The invention relates to a reminding method and device of a dust collector. The method includes the steps that when a working instruction on the dust collector is detected, characteristic parameters of particles sucked by the dust collector currently are measured; according to the pre-acquired corresponding relationship between a brush head and the particle characteristic parameter range, and whenit is determined that the currently working brush head of the dust collector is not matched with the characteristic parameters of the currently sucked particles, reminding operation corresponding tothe currently working brush head is executed, wherein the reminding operation is used for reminding a user of replacing the currently working brush head. According to the technical scheme, the user can be automatically reminded of replacing the currently working brush head, the problem that cleaning is incomplete and the cleaning efficiency is low due to the fact that the brush head does not adaptto the current working environment is avoided, the intelligent level of an intelligent socket is improved, the cleaning efficiency is improved, and the user experience is improved.