Speaker box

A speaker box, comprising:

• an upper cover comprising an upper cover body, an upper cover port passing through the upper cover body, and an upper steel sheet fixed to the upper cover body and completely covering the upper cover port;
• a lower cover comprising a lower cover body, a lower cover port passing through the lower cover body, and a lower steel sheet fixed to the lower cover body and completely covering the lower cover port;
• a receiving space, wherein the upper cover and the lower cover are assembled to form the receiving space;
• an acoustic unit received in the receiving space and dividing the receiving space into a front sound cavity and a rear cavity;
• and
• an insert plate arranged in the rear cavity;
• wherein 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.