The Bluetooth headset can be charged with the phone charger, yes.
Because Bluetooth headphones and mobile phones use the same universal USB interface charging, as long as the charger output voltage and current meet the requirements of Bluetooth headphones, you can use the mobile phone charger to charge.
However, it should be noted that not all Bluetooth headsets can be charged using a mobile phone charger, so you need to read the instructions or consult after-sales service when buying Bluetooth headsets.
In addition, if the Bluetooth headset is equipped with a fast charging function, it may not be possible to achieve fast charging when using a mobile phone charger, and a special charger is needed to play a fast charging effect.