The invention discloses a hook vertical bar assembly sectional bar of a thermal-insulation sliding window and relates to the field of building materials. The hook vertical bar assembly sectional bar of the thermal-insulation sliding window comprises a hook vertical sectional bar, a hookless vertical sectional bar and a frame sectional bar. Thermal-insulation glass is fixedly installed between the hook vertical sectional bar and the hookless vertical sectional bar, and the right end of the hookless vertical sectional bar and the frame sectional bar are combined in a butted mode. The hook vertical sectional bar comprises a cavity similar to a rectangle, an upper fixing plate and a lower fixing plate which extend to the right are arranged at the upper end and the lower end of the right of the cavity respectively, the front end of the upper fixing plate and the front end of the lower fixing plate are respectively provided with a right-angle folding side bent inwards, a glass fixing cavity with three faces closed is formed by the upper fixing plate, the lower fixing plate and the right side wall of the cavity, the lower end of the cavity is provided with a butted-combination baffle and a rough side mounting groove, the rough edge mounting groove is formed in the left of the butted-combination plate, and the butted-combination face arranged at the front end of the butted-combination baffle is an inclined face. The hook vertical bar assembly sectional bar of the thermal-insulation sliding window is simple in structure, reasonable in design, convenient to construct and install, safe and environmentally friendly in use, high in production efficiency, low in cost, good in sealing performance, low in noise and capable of being widely applied to aluminum alloy sashes, and components are not prone to deformation.