The invention discloses a practical mailbox. The practical mailbox comprises a base mounted on the bottom of the mailbox and an induction prompting panel cooperatively connected with the base, aninserting clamping groove is formed in the left end surface of the base, a power feeding groove is formed in the center of the right side wall of the inserting clamping groove, pushing sliding grooves areformed in the front and rear sidewalls of the inserting clamping groove in a peer-to-peer manner, first engaging grooves are formed in the front and back of the left end of the inserting clamping groove in a peer-to-peer manner, and second engaging grooves communicated with thepushing sliding grooves are formed in the front and rear side walls of the inserting clamping groove in a peer-to-peer manner. According to the practical mailbox, a gravity sensor senses letters and transmits a signal to the induction prompting panel, the induction prompting panelprompts that there are letters in the mailbox, and a user can know whether there are letters in the mailbox without the need to openthe mailbox, so that the user experience is improved, and the induction prompting panel is firmly locked to facilitate stable working.