The invention provides a truss node connecting structure, a connecting clamp and a truss structure. The connecting clamp is composed of a first clamping block, a second clamping block and a clamping mechanism, wherein the first clamping block and the second clamping block are suitable for being arranged on the two sides of a chord rod and a web rod and are mutually buckled, and the clamping mechanism clamps and connects the first clamping block and the second clamping block. The first clamping block and the second clamping block are mutually buckled to form a first clamping part clamping a first connecting part and a second clamping part clamping a second connecting part. The connecting clamp connects the chord rod and the web rod together through the first clamping part and the second clamping part, in the connecting structure, the chord rod and the web rod are not punched and have certain distances in position, the transfer process of force is completed through the first clamping part and the second clamping part of the connecting clamp, through the arrangement mode, a series of weak points of force of opening holes and the like are omitted, a load is prevented from damaging the weak points, and the stability of the whole structure is improved.