The invention discloses an improved ultrasonic vibrating screen fastening device. The improved ultrasonic vibrating screen fastening device comprises a first pressing rod and a second pressing rod which are clamped on the upper side and the lower side of screen cloth, and the second pressing rod is located over the first pressing rod; an installation block is fixed to one end of the first pressing block, an installation groove is formed in the top of the installation block and internally provided with a spring, and the upper end of the spring is fixed to the bottom of the second pressing rod; the side face of a clamping connection block is provided with a clamping groove; a limiting block is arranged at the top of the end, away from the installation block, of the first pressing rod, and one side of the limiting block is provided with a limiting protrusion; the bottom of the limiting block is provided with an opening part, a connection plate is fixed to the bottom of the limiting block, and the side face of the connection plate is provided with a bearing; and a threaded rod is in threaded connection with the end, away from the installation block, of the first pressing rod, and one end of the threaded rod extends into the inner circle of the bearing. The improved ultrasonic vibrating screen fastening device is novel in structure, ingenious in design, reasonable in structure and suitable for popularization.