Provided is a speaker box, including: an upper cover, an upper steel sheet; a lower cover, a lower steel sheet; a receiving space, an acoustic unit; and an insert plate arranged in the rear cavity. Upper and lower sides of the insert plate abut against the upper steel sheet and the lower steel sheet, respectively, a position of at least one of the upper steel sheet or the lower steel sheet aligned with the insert plate is provided with a fixing groove passing therethrough, and the insert plate is fixed to at least one of the upper steel sheet or the lower steel sheet through glue injection in the fixing groove. The speaker has characteristics of convenient mounting, good anti-shell vibration effect, and reduced mounting space.