The invention discloses a device for pressing and fixing a supporting anchor net by making pressing plates be attached to the roadway wall through matching of the pressing plates and threaded rods. The device is characterized in that a plurality of rotating grooves are formed in the outer wall of one end of a main body cylinder at equal intervals, fixing lugs are arranged in the rotating grooves and connected with the main body cylinder, and one ends of supporting rods are arranged on the fixing lugs in a hinged mode; the middles of the upper sides of the pressing plates are arranged at the other ends of the supporting rods in a hinged mode, the upper side surfaces of the pressing plates are arc-shaped surfaces, the middles of the arc-shaped surfaces are high, and the two ends of the arc-shaped surfaces are low; a plurality of pressing grooves are formed in the lower side surfaces of the pressing plates, the pressing grooves are internally provided with rubber pads, and a plurality ofteeth are arranged on the supporting rods; protective blocks are arranged on the supporting rods, a rotary groove is formed in the inner wall of the other end of the main body cylinder, one end of a pressing sleeve is arranged in the other end of the main body cylinder, and the other end of the pressing sleeve is arranged outside the main body cylinder; and a rotating block is arranged on the outer wall of one end of the pressing sleeve and arranged in the rotary groove, the inner wall of the pressing sleeve is provided with a thread, one end of a rotary sleeve is arranged at the other end ofthe main body cylinder in a sleeving mode, and the other end of the rotary sleeve is arranged on the pressing sleeve in a sleeving mode.