The invention relates to an integral pushing erection method for truss girders. The method comprises the following steps: splicing the truss girders, and enabling the two spliced truss girders (a left girder and a right girder) to be connected through a horizontal connecting steel pipe so that the integrated truss girders are formed; installing continuous-action jacks, installing a working platform between the two truss girders, and enabling two sides of the working platform to be respectively provided with one continuous-action jack; installing steel strands, enabling at least one steel strand to penetrate through the inside of the continuous-action jack of each side, enabling one ends of the steel strands to be anchored on bridge piers in front of the truss girders, and enabling the other ends of the steel strands to droop naturally; pushing and horizontally moving the truss girders, enabling the truss girders to pass across the bridge piers; and enabling horizontal jacks to be further installed at the tops of the bridge piers so that horizontal movement of the truss girders can be achieved. By the integral pushing erection method for the truss girders, the inverted triangular truss girders can be integrally pulled in place, the assembly difficulty is reduced, safety and efficiency are improved, the horizontal movement alignment is accurate, and butt joint quality of the truss girders is guaranteed.