This invention discloses a valve with filter. It can filter and reversal directionally clean to filter core, the bypass at front and back of valve etc. function. It can be fitted at inlet pass or inlet and outlet pass of auto-valve, and can be used to substitute the complex pipeline of bypass at insulated installation. This invention also discloses a simple structure of multi-pass rotating valve, saving a set of sealing part, and increasing working state. This invention adventages of simple pipeline, convenient use, low cost, and wide application etc..