The invention provides a lining feeding and assembling mechanism of a blacket front sewing machine, and belongs to the technical field of clothing manufacturing devices. The technical problem that anexisting blacket front sewing machine cannot conduct full-automatic feeding is solved. The blacket front sewing machine comprises a machine frame. A conveying platform for conveying clothing cut pieces is arranged on the machine frame and provided with a conveying belt. A material plate frame is arranged on the machine frame and located on the lower side of the conveying platform. A notch is formed in one side of the conveying platform. A guide structure for guiding a lining roll on the material plate frame to the lower end face of the notch of the conveying platform is arranged on the machineframe. A guide assembly for inwards turning the clothing cut pieces at the notch is arranged on the side of the conveying platform. By means of the lining feeding and assembling mechanism, the automatic lining feeding can be realized, linings are in precise butt joint with the clothing cut pieces, the production efficiency and automation degree are improved, time and labor are saved, and convenience and reliability are realized.