Single-power double-stroke linear motion mechanism for endoscope robot

The invention provides a single-power double-stroke linear motion mechanism for an endoscope robot, and the mechanism comprises a first-stage rail bottom plate (10) which is provided with a first linear guide rail module and a ball screw module (13), and the ball screw module (13) is used for driving a second-stage rail bottom plate (11); a group of second linear guide rail modules is arranged above the second-stage rail bottom plate (11), and the first end of the second linear guide rail modules is connected with a first sliding block (121); the two U-shaped wheels (15) are arranged at the two ends of the second linear guide rail module respectively, the steel wire (16) with the terminals is wound around the two U-shaped wheels (15), and the two limiting terminals (161) are installed at the second end of the first-stage rail bottom plate (10); the first end of the driving unit cantilever (18) is connected with a second sliding block (123) of the second linear guide rail module and is connected with a steel w