Many of the EU laws are laws that we in the UK would have passed anyway, if we had not been in the EU. Laws relating to health and safety, environmental issues and many others.
In fact the British Parliament has already passed an Act that incorporates many, if not most, EU laws into British legislation, so Doodle, even after Brexit you will still have to comply with EU law, that British governments were so in favour of, that they have kept them.
As others have pointed out, the EU is us, not a group of aliens with whom we have no involvement, but who make laws for us. We made these laws when we were in the EU and we want to keep them.