The new package of aid will be used to provide seeds, shelter and training to more than 700,000 people, International Development Secretary Justine Greening said.
Monsoon flooding killed hundreds and affected more than four million people in southern Pakistan.
More than one million are still without adequate shelter, says the Department for International Development.
Funding will be used to help 50,000 families buy building materials as well as training on how to construct flood-resistant housing, while seeds, chickens and farm skills training will go to more than 690,000 people.
Ms Greening said: "We have emergency supplies in place for a fast response to this year's monsoon.
"In addition to providing crop seeds and training in farm skills to get people back on their feet, the UK is helping them build homes that will stand up to future flooding, breaking the vicious cycle of the annual rains."