The invention relates to a blockage-proof filter. An edge of the filter is of a stainless steel edge-covering structure; grooves and bulges arranged at intervals are formed in the middle of the filter; filter screens are arranged on the top parts of the bulges; a distance between the top part of each bulge and the bottom part of each groove is 4 to 6cm. Compared with the prior art, the blockage-proof filter provided by the invention is simpler in structure; the filter screens are arranged on the top parts of the bulges, the filter can be effectively prevented from being blocked, matters easilyresulting in blockage can sink in the grooves, after water is removed from the filter screens, and the matters easily resulting in blockage can be manually taken out so as to be treated, so that theblockage-proof filter is convenient and practical, and suitable for being popularized and applied in a large scale.