The invention provides an emergency slurry supplement circulation technology method for slurry shield and a device thereof, and relates to the field of shield tunnel construction. The emergency slurry supplement circulation technology method includes a basic slurry supplement step and an emergency slurry supplement step, specifically, according to the basic slurry supplement step, new slurry in a new pulp tank is transported to a slurry mixing tank, the new slurry is mixed with filtrated slurry in a sedimentation tank to form supply slurry to supplement the shield. The basic slurry supplement step can meet requirements for slurry in common conditions, when an emergency requiring a large amount of slurry supplement happens, construction workers conduct operation of the emergency slurry supplement by transporting slurry in the sedimentation tank to the new slurry tank to mix with bentonite of a shear pump in the new slurry tank to obtain new slurry quickly, or directly mediating materials like the bentonite in a pulping warehouse and transporting high concentrated slurry prepared in the shear pump to a supply tank to prepare flurry rapidly to conduct supplement, and prevent happening of accidents.