This invention relates to a supporting device for coal-winning working face, which includes top beam, shielding plate, base, post and hydraulic system. It features as follows: The top beam uses a crawler-type structure; The post under the top beam is hinged to top beam and base respectively at its two ends; A hydraulic balance tube, on which a balancing valve is installed, and which is connected to the working cavity of the post, and arranged between the posts. Besides, a moving cylinder is hinged between the one end of base and the top beam. With such structure, the supporting device in coal tunnel can move forward without unloading it, so protecting the integrity of head plate, improving the safety condition underground, and saving a lot of high-grade timber.