I need to make an UV animation.

I add an UV Edit node,but can't add key frame in any parameter of this node.

Please help me.

one way is to:
ensure your uv's are Point (use the attribute promote if you need to convert)
put down a uvedit node - edit your uvs
put down a blendshapes node
wire your original geometry into the blendshapes node
then wire the uvedit into the blendshapes node
turn of Blend Texture
now you can use the blenshapes node to blend from one uv to the other


hth