The utility model discloses a rhombus section insulator, be in including main insulating structure, setting the last slide of main insulating structure is in with the setting the switching mounting at main insulating structure both ends, main insulating structure includes last insulating rod that the level laid and lies in the insulating rod below and just is the lower insulating rod that the cross was laid with last insulating rod, the both ends that insulating rod under was installed to the switching mounting, the both ends of going up the insulating rod are provided with the bridging binding clip, the slide is installed between bridging binding clip and switching mounting, it presss from both sides to be provided with contact wire connection wire on the switching mounting. The utility model has the advantages of simple structure and reasonable design and fail safe nature is high, through setting up insulating rod and insulating rod down, and goes up the insulating rod and is the cross with insulating rod down and lays, reduces the whole deformation of insulator to reduce the wearing and tearing that contact wire connection wire pressed from both sides the contact wire of department, satisfy the installation of large tension district section contact net.