The invention discloses an adjustable photovoltaic panel support; the first slide block and the second slide block are fixed on the bottom of the support; the first slide block is arranged on the first guiderail in a slide manner; the second slide block is arranged on the second guiderail in a slide manner; the first and second guiderails are arranged in parallel; the support transversely stretches over the first and second guiderails, and moves along the first and second guiderails; a control system is connected with the first and second slide blocks; two ends of the first and second guiderails are fixedly connected with fixed seats; the fixed seats are fixed on the first transverse rack and the second transverse rack, and provided with elastic units; the first transverse rack is fixed bythe first vertical rod; the first vertical rod is arranged between the first and second guiderails; the second transverse rack is fixed by the second vertical rod; the second vertical rod is arrangedbetween the first and second guiderails; a hinge device is arranged between the support and a support bar; the bottom of the support bar is fixed on the pedestal; an elevation adjusting device is arranged on the support. The adjustable photovoltaic panel support is high in stability, and can improve the solar energy-electric energy conversion efficiency.