In order to solve the waste problem of artificial, shielding material, PVC glue and other aspects during the spraying process of PVC bottom coating protective glue, the UBC robot is equipped with quantitative cylinder by adopting the internationally advanced robot 3D glue gun gun head to spray,accurately control the flow rate of spraying glue and the limit position of the trajectory of the robot’s gun head, and cooperate with the multi-angle spraying posture to realize the elimination of masking process in the spraying process of PVC bottom coating protective glue.