The invention discloses a molding method of a locking plate for a locking mechanism of a tilting cab. The method comprises the following steps: (1) cleaning the surface of a plate, and adding the plate to an activation solution in order to carry out activation treatment; (2) adding the plate into a vacuum chamber, vacuumizing the vacuum chamber to a limit, carrying out nitrogen displacement threetimes, raising the temperature in the vacuum chamber to 200-300 DEG C, carrying out heat insulation, introducing a silane gas to the vacuum chamber, continuously raising the temperature in the vacuumchamber to 410-430 DEG C, carrying out heat treatment for 9-12 h, cooling the vacuum chamber to room temperature, and taking out the plate; and (3) heating the plate, carrying out heat treatment, adding the plate to a hot stamping die, and carrying out hot stamping treatment. The locking plate for the locking mechanism, obtained by the method, has a high hardness, so the locking plate is not proneto be worn in the use process; and the locking plate has a high tensile strength, so the locking plate does not deform.