The invention provides a truss. The truss comprises a first truss body, a second truss body, a third truss body and two fixing plates, and the first truss body and the third truss body are capable of rotating relative to the second truss body. In use of the truss, the first truss body, the second truss body and the third truss body form a whole triangular-section truss body with a stable supporting structure, and the two fixing plates are arranged above and below the whole truss body respectively to form a steady truss structure. In disassembly, the fixing plates and the whole truss body are separated, the first truss body and the third truss body can be rotated to two sides of the second truss body respectively and stacked for placement, and accordingly small space occupancy and convenience in carrying and transport are realized. The truss has advantages of simple structure, reasonable design, simplicity and convenience in assembly and disassembly and convenience in transport.