VOCs collecting device and using method thereof

The invention discloses a VOCs collecting device. The VOCs collecting device comprises a support platform. The top of the support platform is provided with a gas-liquid separator, a support frame anda liquid collecting box from left to right, and the liquid collecting box is positioned in the support frame. The top of the support frame is fixedly provided with a storage box. In the VOCs collecting device, through a designed fastening mechanism for increasing stabilization of the liquid collecting box, shaking of the liquid collecting box is reduced while the collecting device is moved, and the liquid collecting box is convenient for detaching, repairing and replacing while worn; and through fixing two oppositely distributed connecting sheets at the inner side face of a push plate, the inner sides of the two connecting sheets are connected with a protection plate through a rotating shaft, so the protection plate is conveniently overturned, while a control plate is used, the protectionplate is upwards lifted, a