The invention discloses a scroll bar control method and device. The scroll bar control method comprises the following steps of nesting a native scroll bar container where a native scroll bar of a browser is located into a preset outer layer container; monitoring a scrolling event of the native scroll bar container; operating a position of a user-defined scroll bar in the outer layer container according to the scrolling event corresponding to the native scroll bar container so as to enable the user-defined scroll bar to be consistent to the native scroll bar. The scroll bar control method and the device have the beneficial effects that the scroll bar can be user-defined, meanwhile, an event system and a default behavior of the native scroll bar are maintained, the implementation code is simple, and the speed of loading page by users cannot be affected at all.