Acting Deputy Chief Officer Ruari Hardy is representing Guernsey Police at the full force funeral at Southwark Cathedral.
The flag at the station is also being flown at half-mast to coincide with the funeral.
PC Palmer, 48, who was married with a five-year-old daughter, was guarding the Houses of Parliament on 22 March when he was stabbed by Khalid Masood.
Guernsey Police said: 'Our thoughts and prayers remain with the families of all of those who were killed or injured at the time.'
