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This invention discloses a spring-loaded quick-adjustable chassis device, comprising a base as the main support, a backrest connector rotatably mounted on the base and used to connect to the chair back, a spring-loaded component linked with the backrest connector, and an adjusting component movably mounted on the chassis. The spring-loaded component includes a first spring, a second spring, and a floating component disposed between the two. The two springs are arranged in series via the floating component. The first spring is located between the backrest connector and the floating component, and the second spring is located between the base and the floating component. The adjusting component has at least two positions that act on the floating component, and its movement can change the travel of the floating component. When the floating component is within its travel range, it is in a floating state, and the two springs act in series on the tilting motion of the backrest connector. When the floating component reaches the end of its travel range and is restricted by the positions, only the first spring acts alone. This solution achieves flexible switching of the spring-loaded mode by quickly switching the positions through the adjusting component. The series-loaded mode is suitable for lighter users, and the single-spring mode is suitable for heavier users, meeting the tilting spring-loaded needs of different users.