The utility model relates to a triangular truss in a hanging basket for suspension casting box girder construction, which is provided with at least two trusses and comprises diagonal draw bars (11), vertical bars (12), longitudinal beams (13) and transverse trusses (14). The number of the diagonal members (11) is two, one ends of the two diagonal members (11) are fixed together, the other ends ofthe two diagonal members (11) are respectively connected with the longitudinal beams (13), and a triangular structure is formed between the two diagonal members (11) and the longitudinal beams (13); the vertical rod (12) is located between the two diagonal draw bars (11), the upper end of the vertical rod (12) is connected with the two diagonal draw bars (11), and the lower end of the vertical rod(12) is connected with the longitudinal beam (13); the transverse truss (14) is arranged between the two triangular trusses and connected with the connecting pieces on the two sides of the vertical rod (12) through bailey pins. Through the form of the triangular truss, under the condition that the same pouring operation area is met, due to the fact that the moment borne by the suspended formworkis small, the continuous suspended pouring formwork is suitable for the continuous suspended pouring box girder with the large main bridge span.