No, because the power bank itself is also consuming electricity when it is charging. If you charge the mobile phone with the charging bank at the same time, the power of the charging bank will not only not be full, but also accelerate the consumption of the charging bank. Therefore, in order to protect the power bank and other devices, it is not recommended to use the power bank to charge other devices while charging the power bank.
General charging treasure does not support two power supply at the same time, even if you give it two together, it will recognize one of them. Just like your phone's wifi and 4G network, it automatically chooses one over the other.