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1. A concentric-ring single-sided dovetail groove ceramic tile back mold core, comprising a back mold core iron substrate and a vulcanized rubber of back mold core surface, the vulcanized rubber of back mold core surface comprising raised patterns and recessed patterns which are integrally formed, pasted and covered on the back mold core iron substrate, wherein a first circle of raised pattern is set as a central reference ring pattern centering on a central position of the back mold core, and equidistantly offset ring raised patterns are arranged from the central reference ring pattern to an outermost circle of raised pattern, and the offset outermost circle of raised pattern is an outermost ring pattern, the ring patterns between the central reference ring pattern and the outermost ring pattern are middle ring patterns, and at four corners of the back mold core where the ring pattern cannot be formed, segmental arc patterns or straight line angle arc patterns are formed by being equidistantly offset from the outermost ring pattern; one side of all the raised patterns close to the center of the back mold core forms an obtuse angle with a back mold core plane, while the other sides of all the raised patterns far away from the center of the back mold core form an acute angle with the back mold core plane, the obtuse angles of all the raised patterns are equal, the acute angle of the central reference ring pattern is close to 90 degrees, the acute angle of the outermost ring pattern is the smallest acute angle among all the raised patterns, and the acute angles of the middle ring patterns between the central reference ring pattern and the outermost ring pattern are arranged at an interval of equal angle from the center to the outside in a descending order, and the acute angles of the angle arc patterns are equal to the acute angle of the outermost ring pattern or smaller than the acute angle of the outermost ring pattern; external corners at top portions of the raised patterns and internal corners at junctions of the raised patterns and the recessed patterns are all rounded off; and a part in the central reference ring pattern is an area of ceramic tile trademark or ceramic tile information higher than the recessed patterns.
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