Linkage clamp device of vertical lathe

The utility model discloses a linkage clamp device of a vertical lathe. The linkage clamp device comprises a rack, a lead screw, a bevel gear, a clamp module and a driving device. Four cross-shaped rails are arranged on the rack; and a screw rod is arranged below each track of the rack. A bevel gear is coaxially installed at the end, close to each other, of each lead screw, and the four bevel gears are distributed in a cross shape and meshed with each other in a pairwise mode. A clamp module is installed in each rail, and the lower end of each clamp module is in threaded fit with the corresponding lead screw. The driving device is connected with one lead screw and drives the lead screw to rotate, the lead screw rotates to drive the other three bevel gears to rotate through the bevel gear at the end, the other three lead screws are driven to rotate, and the four clamp modules move in the direction close to or away from the center at the same time. According to the technical scheme, simultaneous advancing and r