The utility model discloses a slide caliper for marshall test, include the main scale and can follow the gliding vernier scale of main scale length direction, be provided with first outer measuring claw on the main scale, be provided with the outer measuring claw of second on the vernier scale, be provided with first angle square on the first outer measuring claw, be provided with the second angle square on the outer measuring claw of second, when the tip contact of the tip of first angle square and second angle square, the zero graduation on the vernier scale aligns with the zero graduation of main scale. When measuring marshall test piece high, contact the both ends of marshall test piece respectively with the end of first angle square and second angle square, the reading that reads slide caliper is the height of measurable marshall test piece, the procedure at test piece both ends interpolation gasket has been removed from to above -mentioned measurement process, has reduced testing personnel's work load, has improved test efficiency.