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I wanna use 1.4.0-dev compiler in intellij, I tried changing multiplatform to 1.4.0-dev-NNNN. it changed libraries to 1.4.0-dev but compiler is 1.3.70-dev. why ?

Because last update of K/N version in Kotlin repo  was month ago:
<https://github.com/JetBrains/kotlin/commit/df2adb060c0167d176c04c606c8eb0045a4c2ad4|https://github.com/JetBrains/kotlin/commit/df2adb060c0167d176c04c606c8eb0045a4c2ad4>

Git shows 1.4.0 <https://github.com/JetBrains/kotlin-native/releases|https://github.com/JetBrains/kotlin-native/releases>

You can use gradle property `kotlin.native.version = 1.4-dev-14127`
to set needed K/N version.

Thanks, but where one can get that "magic" number `1.4-dev-14127` ?

Nowhere, AFAIK. But there is another way to get a nightly K/N. There are special builds of Kotlin Gradle plugin that include latest nightly K/N. They are available at Bintray (<https://bintray.com/kotlin/kotlin-dev/kotlin>) and have a "double" number (e.g. `1.4.0-dev-783-92`). These builds are based on a latest K/N version and Kotlin version which is compatible with this K/N.