The present invention relates to a device for preventing rockfall protection device, a cylindrical case 110 having an upper surface opened, a plurality of rotary wheels 120 rotatably arranged in the top, bottom, left and right in the case 110, the rotary wheels A plurality of rollers 130 arranged in an annular manner so that the upper portion is opened in the inner space formed by the 120, the rotational force of the rotary car 120 is caught by the outer wheels of the rotary wheels 120 and the rollers 130 Lever 153 is installed adjacent to the belt 140 for transmitting the rollers 130 to the rollers 130, the opening 111 of the case 110, and adjusts the pitch of the winding 2 introduced into the case 110. Disclosed is a device for manufacturing a falling rock protection net, characterized in that it comprises a lever operating unit 150 having a), and a driving unit 200 for operating the rotary car 120 and the lever operating unit 150.
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