Sidewall system and a collapsible building applies the sidewall system

A collapsible building comprising:

• a first fixed wall;
• a first sidewall pivoted to the first fixed wall, the first sidewall rotates around the first fixed wall about a first pivoting axis;
• a first single-side eave system comprises a first eave panel hinged to the first sidewall, the first eave panel rotates around a first hinge axis correspondingly;
• a second fixed wall;
• a second sidewall pivoted to the second fixed wall, the second sidewall rotates around the second fixed wall about a second pivoting axis;
• a second single-side eave system comprises a second eave panel hinged to the second sidewall, the second eave panel rotates about a second hinge axis correspondingly;
• the first fixed wall, the first sidewall, and the first single-side eave system form a first sidewall system in open state, at which state angle between the first sidewall and the first fixed wall is 180°;
• the second fixed wall, the second sidewall, and the second single-side eave system form a second sidewall system in open state, at which state angle between the second sidewall and the second fixed wall is 180°;
• the first sidewall system and the second sidewall system in the open state are facing each other;
• a retractable roof includes a plurality of roof sections that each span width of the first sidewall system and the second sidewall system facing each other;
• some of the roof sections are fixed, and some of the roof sections are movable roof sections;
• and
• wherein some movable sections are slidably mounted on top surface of the first and second sidewall, the movable roof sections being moveable in a direction along length of the wall set to convert the retractable roof between an open configuration and a closed configuration, some of the roof sections overlapping one another when the retractable roof is in the open configuration, region between the first sidewall system and the second sidewall system is covered by the roof sections when the retractable roof is in the closed configuration.