The utility model provides a the utility model provides a scalable cable trench cover, including a connection cover plate main part and the 2nd connection cover plate main part, a connection cover plate main part cup joint with the 2nd connection cover plate main part and be connected, a connection cover plate main part each side set up a spread groove, set up the bracing piece between two spread grooves, set up a threaded connecting sleeve in the inboard of spread groove, set up the threaded connection pole in threaded connecting sleeve, the threaded connection pole stretch into the spread groove through threaded connection cover in, the each side of the 2nd connection cover plate main part set up a sliding tray, sliding tray cover insert in the spread groove. The utility model discloses a flexible length of adjusting two apron satisfies the requirement of the on -the -spot different width of cable construction, and simple structure, convenient operation, whole laying process need not to select corresponding width apron, directly take arbitrary product directly lay can, the efficiency of construction is higher, is favorable to the standardization to be manufactured.