The present invention is directed to a washing brush in which a core for fixing washing threads can keep a straight shape thereof rigidly and the threads are fixed to the core uniformly, densely, and rigidly, so that it can be properly applied to an automatic washing device and also prevent the threads from being separated from the core. The present invention provides the washing brush comprising a core having a recess formed at a circumference thereof along an axial direction with a predetermined distance, and a wing formed between the recesses; a plurality of fixing rings surrounding the circumference of the core; washing threads bent at a middle portion thereof, wherein bent portions thereof are caught at each fixing ring and are inserted in the recess; and a fixing means provided to the core and making the rings in close contact with each other.