A Bluetooth adaptive volume adjusting method, comprising: reading, by a smart terminal, an adjustable maximum volume value of a Bluetooth audio device through a Bluetooth protocol from the Bluetooth audio device, and obtaining a user adjustable maximum volume value, after the smart terminal being connected with the Bluetooth audio device; wherein, the smart terminal has audio and video playback functions and is able to connect with the Bluetooth audio device to output audio content, the user adjustable maximum volume value is an adjustable maximum volume set by a volume key of the smart terminal; obtaining a volume value indicated by a volume adjustment instruction that corresponds to a user operating the volume key, after receiving the volume adjustment instruction; calculating a volume value of the smart terminal according to the volume value indicated by the volume adjustment instruction, calculating a volume value of the Bluetooth audio device according to the volume value indicated by the volume adjustment instruction, the adjustable maximum volume value of the Bluetooth audio device, and the user adjustable maximum volume value; and setting the volume of the Bluetooth audio device according to the calculated volume value of the Bluetooth audio device, setting the volume of the smart terminal according to the calculated volume value of the smart terminal; characterized in that, a formula for calculating the volume value of the Bluetooth audio device according to the volume value indicated by the volume adjustment instruction, the adjustable maximum volume value of the Bluetooth audio device, and the user adjustable maximum volume value being as follows: B ′ Volc = lg 1 + Vol C lg 1 + Vol max ∗ B Volmax; in which Vol c is the volume value indicated by the volume adjustment instruction; Vol max is the user adjustable maximum volume value; B Volmax is the adjustable maximum volume value of the Bluetooth audio device; B' Volc is the volume value of the Bluetooth audio device. reading, by a smart terminal, an adjustable maximum volume value of a Bluetooth audio device through a Bluetooth protocol from the Bluetooth audio device, and obtaining a user adjustable maximum volume value, after the smart terminal being connected with the Bluetooth audio device; wherein, the smart terminal has audio and video playback functions and is able to connect with the Bluetooth audio device to output audio content, the user adjustable maximum volume value is an adjustable maximum volume set by a volume key of the smart terminal; obtaining a volume value indicated by a volume adjustment instruction that corresponds to a user operating the volume key, after receiving the volume adjustment instruction; calculating a volume value of the smart terminal according to the volume value indicated by the volume adjustment instruction, calculating a volume value of the Bluetooth audio device according to the volume value indicated by the volume adjustment instruction, the adjustable maximum volume value of the Bluetooth audio device, and the user adjustable maximum volume value; and setting the volume of the Bluetooth audio device according to the calculated volume value of the Bluetooth audio device, setting the volume of the smart terminal according to the calculated volume value of the smart terminal; characterized in that, a formula for calculating the volume value of the Bluetooth audio device according to the volume value indicated by the volume adjustment instruction, the adjustable maximum volume value of the Bluetooth audio device, and the user adjustable maximum volume value being as follows: B ′ Volc = lg 1 + Vol C lg 1 + Vol max ∗ B Volmax; in which Vol c is the volume value indicated by the volume adjustment instruction; Vol max is the user adjustable maximum volume value; B Volmax is the adjustable maximum volume value of the Bluetooth audio device; B' Volc is the volume value of the Bluetooth audio device.