The utility model discloses a connective component for a blanket plate and a support beam. The connective component contains a stud bolt which passes through a screw of the blanket plate. An upper nut and a lower nut are respectively screwed on the upper and lower portions of the stud bolt. A bolt connective fastener is disposed between the lower nut and the support beam. A sleeve is arranged between the upper nut of the stud bolt and the blanket plate. A vertical slot opening is disposed on the wall of the sleeve in vertical direction. A transverse slot opening is disposed on the wall of the sleeve in cross section direction. The transverse slot opening communicates with the lower end portion of the vertical slot opening. The stud bolt is provided with a horizontal hole. A block pin is pined into the horizontal hole through the above mentioned vertical slot opening or transverse slot opening. The bottom of the horizontal hole is equipped with a clip reed, the bottom of which is provided with a spring. According to the utility model, unilateral fastening is realized for assembly of the blanket plate and the support beam and is an effective reconstruction approach of the prior art. Manpower is saved. The bolt connective component has obvious advantages when used in foundation pit engineering and brings safety guarantee for underground construction and overground transportation.