the reflection is too unreal

The reflection like in the picture is really not usable,even in the light and reflection examples, I want to get a reflection effect that is at least continuous, what should I do?
PS:The SSR in the Global PostProcess is checked off

Actual mirror reflections are pretty darn expensive, and still not a thing you want to do in gamedev.
Sphere reflection captures and all are used for roughness channels in materials to create a rather accurate looking reflection on a rough surface.

for actual mirror effects you’d need to do scene captures, fake a mirror by duplicate/mirror the room, etc, etc.
You can take a look at: Unreal Engine 4 Mirror plane - correct reflection and rotation independent - YouTube and read the comments as well.

That might result in some options.