The invention relates to a shock absorbing spacer of insulator strings. The insulator strings comprise a set square, II-shaped insulator string components which are vertically arranged at the two ends of the set square and formed by the insulator strings, connecting plates and hanging plates through series connection, and a horizontal connecting component which connects the insulator strings in a horizontal direction. The horizontal connecting component is a component formed by two T-shaped connecting members through a shock absorbing component and is shaped like a Chinese character "zhong". The two ends of the horizontal connecting component are provided with connecting components which are flexibly connected with the insulator strings. The insulator strings are insulator strings made of glass or ceramics. According to the spacer, the spacer is additionally arranged between the suspension insulator strings in a power transmission line so that the integrality of the insulator strings can be enhanced, the problem of mutual swinging between the suspension insulator strings can be solved and the safety and the reliability of the line can be enhanced.