The invention relates to the information technology industry field and particularly relates to a multitask switching method and device. The method comprises steps of establishing corresponding task notch channels when two processing task requests of at least two clients are received, allowing fiber equipment to process a task processing request in one task notch channel, monitoring the processing state of the task processing request executing processing, determining whether the processing state is an execution waiting state, and if yes, switching the fiber equipment to connect another task notch channel. The efficiency of processing multiple task processing requests is improved, and the fiber equipment does not wait task processing requests in the processing waiting state anymore and is switched to other task notch channels for executing other task processing requests, so that free switching of multiple task notch channels is achieved, multiple task processing requests of multiple clients can be met, and limited resources of the fiber device are dispersed and utilized.