Surgical robotic arm and surgical robot

A surgical robot, comprising a surgical robotic arm, wherein the surgical robotic arm comprises a presurgical positioning assembly, a telecentric manipulating assembly and an executing assembly, wherein

• the telecentric manipulating assembly comprises a static platform, a first movable platform and a plurality of first telescopic elements disposed parallelly between the static platform and the first movable platform, a parallel mechanism is formed by the static platform, the first movable platform, and the plurality of first telescopic elements,
• a side of the static platform opposite to the first movable platform is connected to the presurgical positioning assembly, a side of the first movable platform opposite to the static platform is connected to the executing assembly, and both ends of each first telescopic element are rotationally connected to the static platform and the first movable platform respectively, and
• the executing assembly has a preset telecentric fixed point, coordinated extension and retraction of the plurality of first telescopic elements is capable of controlling the first movable platform to move relative to the static platform and drive the executing assembly to extend and retract and swing, a swing center of the executing assembly is preset telecentric fixed point, and a telescopic path of the executing assembly passes through the preset telecentric fixed point,
• wherein the preset telecentric fixed point is a fixed point selected and fixed along a length direction of the executing assembly, and a position of the preset telecentric fixed point is selected in a single surgical operation and is changed in different surgical operations.