The invention relates to an inclined wire papermaking apparatus, comprising a constant pressure pulp-distributing tank, a stainless steel pulp distributor, an inclined wire pulp flow box, a dewatering box, a breast roll, and a forming wire mesh. The constant pressure pulp-distributing tank comprises an upper tank body, a lower tank body, support legs and an orifice plate. The stainless steel pulp distributor comprises a pulp distributor body, and a plurality of pipes made of stainless steel are distributed on the pulp distributor body. The inclined wire pulp flow box comprises a box body, an upper lip component is movably arranged in the box body, the box body is of closed structure, the upper lip component comprises a rear upper lip plate and a front upper lip plate, the rear upper lip plate is rotationally connected with the front upper lip plate, a plurality of transverse beams are fixed on the box body, a first cylinder, a first turbine box, a second cylinder and a second turbine box are fixed on the transverse beams, and the dewatering box comprises a box body, a lower dewatering mesh, an upper dewatering mesh, a drain pipe and a pulp discharging pipe. The inclined wire papermaking apparatus has the advantages of reasonable parameter setting, good pulp flow uniformity and stability, and good forming effect.