Disclosed are a filtering method and device, an encoder and a computer storage medium. The method comprises: acquiring sample information to be filtered, acquiring at least one piece of side information, and inputting at least two components of the sample information to be filtered and at least one piece of side information into a filter based on a neural network so as to output at least one component after the sample information to be filtered is filtered. Further provided are a filtering device, an encoder and a computer storage medium.