The invention discloses a wooden door frame connecting structure. The wooden door frame connecting structure comprises mortise joint pieces (1) and wooden frame splicing pieces, wherein the wooden frame splicing pieces comprise a first wooden frame (2) and a second wooden frame (3), notches are formed in the spliced edges of the wooden frame splicing pieces, the adjacent edges of the first wooden frame (2) and the second wooden frame (3) are mutually connected, the mortise joint pieces (1) are embedded in the notches, and the first wooden frame (2) and the second wooden frame (3) are fixed through the mortise joint pieces (1). The section of each mortise joint piece (1) is in the shape of a sand clock. The notches of the wooden frame splicing pieces become wider gradually from outside to inside. The wooden frame splicing pieces are spliced in an oblique-angle seam mode. Each pair of notches in the edges of the wooden frame splicing pieces is provided with one corresponding mortise joint piece (1). According to the wooden door frame connecting structure, the problem that rusting can occur after wooden frames are fixed with nails for a long time is solved, labor is greatly reduced, the schedule of construction is accelerated greatly, and labor efficiency is greatly improved.