The invention relates to a production method for a continuous glass fiber mat. The production method comprises the following steps of 1, drawing, wherein glass fibers are drawn into fiber strands through a tank furnace; 2, formation of a single-layer semi-finished mat roll, wherein a screen cloth roll is unwound to the lower side of a throwing wheel of a single silk throwing mechanism, the fiber strands obtained in the step 1 are thrown to the moving screen cloth in the direction perpendicular to the screen cloth roll unwinding direction, after silk throwing is finished, the strands and the screen cloth are wound together to form a roll, and the single-layer semi-finished mat roll is formed; 3, preparation of strand mats, wherein according to the gram weight requirements of the strand mats, a plurality of single-layer semi-finished mat rolls are unwound and laid, the screen cloth are drawn out, and semi-finished strand mats are formed; 4, aftertreatment, wherein an adhesive accountingfor, by weight, 0.5-10% of the finished mat is uniformly sprayed to the semi-finished strand mats through a powder throwing device, then drying curing, cooling and compression are conducted, and the continuous glass fiber mat is formed. The production method has the advantages that the energy consumption is low, the cost is low, and the area occupied by the device can be reduced.