The invention provides a novel portable roof photovoltaic support. The support comprises L-shaped main supports, supporting angle iron, a weight block, adjustable telescoping columns, adjustable telescoping rods, angle adjustable clamps and angle adjustable slots, wherein the supporting angle iron is mounted on the L-shaped main support in pair to form a weight bearing area for placing the weight block, each L-shaped main support is composed of a vertical support column and a horizontal support rod perpendicular to the vertical support column, each adjustable telescoping column sleeves the corresponding vertical support column, each adjustable telescoping rod is sleeved by the corresponding horizontal support rod, bolts are used for adjusting the length, the angle adjusting clamps are hinged to hinge portions at the outer top ends of the adjustable telescoping columns, and the angle adjustable slots are hinged to hinge portions at the outer top ends of the adjustable telescoping rods. The novel portable roof photovoltaic support is wide in application and simple in installation, improves the power generation efficiency and construction safety, shortens an investment period, and greatly improves the benefit of a present cement roof photovoltaic construction project.