A double V-shaped linear tapered slot monopulse antenna can be applicable to the systems of tracking, detection, communication, measurement, astronomical observation, etc. The antenna comprises an upper layer metal copper bonded surface (1), a lower layer metal copper bonded surface (2), a dielectric substrate (3), a metallized through hole (4), a substrate integrated waveguide 90-degree directional coupler (51), a 90-degree phase shifter (52), a substrate integrated waveguide H-plane wave generator (6), an input port (71), an output port (72), a double V-shaped linear tapered slot antenna (8), an upper surface triangular metallic cladding (81) and a lower surface triangular slot (82); a multimode substrate integrated waveguide is adopted for feeding to form a monopulse antenna. The double V-shaped linear tapered slot monopulse antenna works at the millimeter wave frequency band, can be directly applied to the integrated circuit design, and is characterized by low consumption, small volume, low cost and being easy for mass production, etc.