The invention provides an elastic suspension clamp for connecting wires of a power transmission iron tower. The lower part of a platelike pulling plate is connected with bayonet plates, a clamp bolt is traversed between the two bayonet plates, a knife-shaped clamping rod with two knife-shaped ends is fixed at the upper end of the pulling plate through an upper locking bolt, sleeve threaded rods are sleeved on the knife-shaped clamping rod respectively, and sleeve threaded rod cap nuts are arranged on the sleeve threaded rods; a lower locking bolt slotted hole groove is formed in the lower part of the pulling plate, a lower locking bolt is arranged in the lower locking bolt slotted hole groove, and a spring is tensioned between the upper locking bolt arranged on the upper part of the pulling plate and the lower locking bolt. Due to the fact that the spring is arranged between the two locking bolts on the suspension clamp provided by the invention, and the lower locking bolt is arranged in the slotted hole groove, the tensioning degree of a suspension line is automatically adjusted through expansion and contraction actions of the spring, and the requirements of suspension intensity and extension force of the wires are met. The elastic suspension clamp has the function and characteristic that the suspension wire perpendicularity is automatically adjusted. The elastic suspension clamp is applicable to being used as a power transmission wire suspension clamp.