The invention discloses a gene detection probe group and a screening method for 50 kinds of genetic diseases of newborns, comprising a detection probe box, wherein the detection probe box is internally provided with a DNA probe, an RNA probe and a label probe; the specific detection method comprises the following steps of: S1, cleaning tissue of newborns; S2, then one membrane of 0.02 mm being cut, and the membrane being soaked in 100% methanol for 10s, and then the membrane becoming translucent, and then soaked in transfer buffer. Six filter papers of the same size being cut, and the blood membrane being shaken in 100% methanol for 5min; S3, labeling it with a labeling probe, and then inserting the DNA probe into the detected membrane, and simultaneously putting isotope, biotin or fluorescent dye into the membrane; S4, inserting RNA probe into the membrane, and injecting SP6 RNA polymerase and T7 RNA polymerase into the membrane at the same time for detection; S5, analysis of the synthetic results of color rendering calculation. The method of the invention has the advantages of accurate detection, low cost and short detection period, and is worth popularizing.