The invention relates to an automatic supply device of a plain washer and a spring washer. The automatic supply device comprises a plain washer vibration motor, a plain washer funnel box, a spring washer vibration motor, a spring washer funnel box, a combined slide-way, a combined washer seat, a bolt box and a traversing air cylinder, wherein the outer side of the plain washer funnel box and the outer side of the spring washer funnel box are respectively provided with the respective vibration motor, the spring washer funnel box is installed below the plain washer funnel box, the lower bottoms of the two funnel boxes are respectively communicated with the combined slide-way, the end part of the lower bottom of the combined slide-way is fixedly provided with the combined washer seat, the bolt box is fixedly installed on the axial side edge of the combined washer seat, bolts are superimposed vertically in the bolt box, the combined washer seat corresponds to a lower outlet of the bolt box, and the traversing air cylinder is coaxially installed in the outlet part on the other side of the bolt box. The automatic supply device is applicable to the assembly requiring a great number of large-sized bolts, one bolt can be prepared in every two seconds, the manmade error rate can be reduced to 1 percent, and the working environment is clean and tidy.