The invention discloses an automatic recycling device for gas making flue dust of a stationary bed. The automatic recycling device comprises a pedestal, a motor, a control panel, a roller and a threaded regulating sleeve; the motor is installed at the center position of the top end of the pedestal; a rotating shaft is installed at the input end of the motor by virtue of a shaft coupler; a dust collecting frame is fixed to the top end of the pedestal; a piston is arranged inside a water storage cavity below a water pipe; the inner walls of a water storage cavity above a reset spring are each provided with stop sunken grooves which are arranged at an equal interval; the outer sidewalls of the two ends of the roller are each provided with a regulating plate; a left screw rod is fixed to the inner sidewall of a regulating groove; one end of the threaded regulating sleeve is in threaded connection with a right screw rod; and the control panel is installed at the center position of the surface of the dust collecting frame. The automatic recycling device disclosed by the invention widens the application range of the automatic recycling device, improves the recycling effect of the automatic recycling device on flue dust and prevents occurrence of a diffusion phenomenon in a recycling process of the automatic recycling device.