The invention relates to a support module for a solar collector having a triangular substructure, formed by: a main structure intended to resist the torsional and bending forces of the collector, and an auxiliary structure that balances the assembly and supports the weight of the mirrors and the absorber tube. The main structure includes: a triangular substructure comprising rectangular pyramids and two half-pyramids at the ends, bars (5) joining the upper vertex of each pyramid (1) to the upper vertex (1) of the adjacent pyramid or to the upper vertex (1') of the adjacent half-pyramid (1'), a diagonal bar (4) joining two opposite vertices of the base of each pyramid, and two king posts (6) located on each end of the triangular substructure. The auxiliary structure includes: arms (7, 7'), struts (8, 8', 8") for each arm (7, 7'), purlins (9) and supports (11) for the absorber tube (12).