The invention provides an opening port mechanism and a pipe fitting machining device with the same. The opening port mechanism comprises a material distributing part, and the material distributing part is used for conveying a fixing block which is to be opened a port and used for vibration reducing a pipe fitting to a preset position; a positioning part and the material distribution part are adjacently arranged, and the positioning part is used for positioning the fixing block; an opening port part is arranged adjacent to the positioning part, and the opening port part is used for opening theport of the fixing block after the block is positioned; and a clamping part is arranged adjacently to the material distribution part, the positioning part and the opening port part; and the clamping part can be movably arranged relative to the material distribution part, the positioning part and the opening port part, when the clamping part moves the fixing block at the preset position to the positioning part for positioning, then the clamping part is used for moving the fixing block after the fixing block is positioned to the opening port part for opening the port. By the adoption of the opening port mechanism, the problem that the machining efficiency of the pipe fitting is low due to the fact that the fixing block is stretched by adopting manual work can be avoided; and by the adoptionof the opening port mechanism, the efficiency of assembling the fixing block on the pipe fitting can be effectively improved, and the machining cost of the pipe fitting machining is effectively reduced.