MAILBOX TANK CAPABLE OF PREVENTING FALSE INDICATION OF IDENTIFICATION

A mailbox tank capable of preventing a false indication of an identification. The mailbox tank comprises a tank cover (1), a tank body (2), and a signboard (3). The signboard (3) is rotated on the side edge of the tank body (2) by means of a rotating shaft (30), and the signboard (3) has a first state and a second state for respectively indicating the absence or presence of a letter in the tank body (2). The mailbox tank further comprises a first matching portion (33) provided on the signboard (3) and a second matching portion (22) which is provided on the side edge of the tank body (2) and can match the first matching portion (33). When the first matching portion (33) is separated from the second matching portion (22), the signboard (3) is in the first state, and at this moment, no letter exists in the mailbox tank; when the first matching portion (33) matches the second matching portion (22), the signboard (3) is positioned on the side edge of the tank body (2) and is in the second state, and at this moment, letters exist in the mailbox tank. The signboard (3) of the mailbox tank is positioned at an identification position, so that the phenomenon of a false indication of a letter in the mailbox tank is prevented, and thus the possibility of letter missing is avoided; the mailbox tank is simple in structure and convenient to implement.