Is there any 24 hrs shuttle bus from Tseung Kwan O (PO Lam) to hong kong airport

There is no 24 hour service buses, but the overnight bus is available. Walk from where you are to Tseung Kwan O Station, Po Yap Road to take bus no. N29 to HKIA directly. It takes around 70min and the bus fare is 24HKD. It only operates at 03:50, 04:20 and 04:50, so choose a suitable one to catch your time!