A tension-shear work holder with 7 loading angles(0°, 15°, 30°, 45°, 60°, 75° and 90°), which can realize different loading states including pure tension, shear and coupled tension-shear, was devised to investigate the mechanical properties of explosive crystal/binder interface in polymer bonded explosive (PBX). Simulation interface of crystal/binder for PBX was then prepared and tension-shear testing method for mechanical properties of interface was explored. Results show that the shear strength of PBX interface(0.980 MPa) was greater than its tensile strength(0.759 MPa). With the increase of loading angle, tension stress decreases while shear stress increases and total stress increases almost linearly. An elliptical model(σ²/a²+τ²/b²=1) is proposed to describe the relationship between tension stress and shear stress for PBX interface, which can describe the tension-shear strength characteristics of PBX crystal/binder interface well.