The invention discloses a level gage and a tripod thereon, wherein the tripod comprises a substrate and several legs; the bottom part of the substrate is vertically provided with a screw rod, and a slide sleeve is arranged on the screw rod; the slide sleeve is rotationally connected with a ball screw nut pair which is in threaded connection with the screw rod; a pull rod is hinged and connected to the middle of the leg and the slide sleeve; a reversing ratchet mechanism capable of limiting the rotation of the ball screw nut pair in a single direction is arranged between the slide sleeve and the ball screw nut pair. Through forming a screw rod transmission mechanism between the ball screw nut pair and the screw rod, the pull rod can generate corresponding upwards or downwards force on the slide sleeve when the leg is opened and closed due to the rotational connection between the ball screw nut pair and the slide sleeve, namely, the upwards or downwards force is generated on the ball screw nut pair; at the moment, the function force can drive the ball screw nut pair to rotate while drive the slide sleeve to slide on the screw rod; the slide sleeve is connected with the leg through the pull rod, thus the leg opening is consistent under the effect of the slide sleeve and the pull rod.