QUICK RISING SUPPORTING DEVICE

A quick rising supporting device includes a bar having a first threaded portion and a second threaded portion on the two sides respectively with a first connecting block and a second connecting block, and an axial portion on top of a supporting arm and a swing arm forming a Y shape bar are respectively axially connected to the first and second connecting blocks. A sliding block is formed on a side of the first connection block. The translatory shift of the bar on the second connecting block motivates the first connecting block to move in same direction when the bar rotates, the first connecting block is led by the first threaded portion to rotate and move forward to achieve the dual displacement speed of the supporting device. When the closed supporting arm and the swing arm bias and swing to open, only biasing and swinging of the supporting arm and the swing arm is required to open the supporting arm and the swing arm by using a low rotate dynamic strength to rotate the bar, thus the elevation angle between the supporting arm and the swing arm can be quickly opened or closed, and the rising operation can be faster and smoother with less time.