A display panel support and a support assembly are provided. The display panel support includes a base, a pillar support, a first clamping assembly, and a second clamping assembly. The pillar support is detachably mounted to the base. The first clamping assembly is disposed on the pillar support. The first clamping assembly includes a first clamping plate and a first adjusting member. The first adjusting member is used for mounting the first clamping plate to the pillar support and adjusting a distance between the first clamping plate and the pillar support. The second clamping assembly is disposed at a bottom end of the pillar support. The second clamping assembly includes a second clamping plate and a second adjusting member. The second adjusting member is used for mounting the second clamping plate to the pillar support and adjusting a distance between the second clamping plate and the pillar support.