Ladder with improved safety structures

A ladder, comprising:

• a main body extending between and upper end and a lower end, the main body including a pair of elongated support members and a plurality of crossmembers extending therebetween;
• a positioning structure connected at an upper end of the main body, the positioning structure including:
• a positioning connecting rod connected to the main body and having two opposing ends;
• a pair of positioning legs, the positioning legs are respectively connected at the opposing ends of the positioning connecting rod;
• and each positioning leg including a positioning link and a positioning plate, wherein the positioning link is connected between the positioning connecting rod and the positioning plate;
• wherein each positioning link comprises:
• a fixed rod, the fixed rod having a first end connected to the positioning link in a non-rotatable manner;
• a pair of rotating rods, wherein a first end of each of the pair of rotating rods is rotatably connected to a second end of the fixed rod;
• a second end of each of the pair of rotating rods connected with its respective positioning plate;
• and
• whereby each positioning plate is configured to provide a stable base against a surface.