An adjustable structure for lamp stand, in which a swivel mount is fitted to the upper portion of a base, thereby enabling ends of a first bar support and a telescopic link to be pin connected to the swivel mount, while the other ends are pin connected to a second bar support. A lamp swivel component is disposed on the end of the second bar support. Accordingly, relative positions between the first bar support, the second bar support and the telescopic link can be freely adjusted, while still providing stable support to the structure.