A novel phase-shifting vectorial-shearing interferometer with a wedge plate phase-shifter is presented to measure the laser wavefront, which is common-path and based on Mach-Zehnder configuration. Vectorial shear (shearing in x and y directions simultaneously) in arbitrary direction is introduced by inserting two wedge plates orthogonally in two arms, respectively. One of wedge plates is split into two parts (parallel part and wedge part), and the phase shift is produced by moving the wedge part in contact along the parallel part, which results in the variation of the optical path difference. The moving distance for 2π phase shift is about several millimeters in a specific condition. Wedge plate phase-shifter increases the moving distance of PSI and makes the control of phase shift relatively easy. The lateral shear errors and phase shift errors induced by wedge plates are also discussed, and the experimental results of phase-shifting vectorial-shearing interference fringes are given.