The Crisis appeal was launched just over five weeks ago to help people living in parts of Palestine which have faced weeks of bombing by Israeli forces.
A ceasefire has now been agreed between the two sides.
Israel was coming under daily rocket attacks before it started air strikes on Gaza although some have accused the Israeli response as being out of proportion.
The money raised by Christian Aid has provided urgent healthcare to more than 18,000 people, clean water for 128,640 and food for 4,650.
Hanan Elmasu, Christian Aid's Programme Manager, said: "Thanks to the generosity of the British public we have so far raised £1 million to provide desperately needed medical aid and emergency support, but there is still so much to be done.
"As the present ceasefire allows our partners to reach out further to those affected, the extent of people's needs will become more apparent."
The extensive destruction of Gaza during the 50-day conflict has left 100,000 people without a home with many still camped in UN schools.
Hanan added: "As well as continuing to distribute food and water, and provide medical support, our partners can now offer longer term psychosocial support to some of those adversely affected by the violence. The hope is that this will also help them deal with the continuing uncertainty and insecurity they face.
"Christian Aid will continue to support people to rebuild their lives and hope for the future."