Telescopic device of highway bridge guardrail

The telescopic device of the highway bridge guardrail comprises a plurality of protection frames arranged front and back, telescopic supporting pieces are fixedly arranged at the left ends and the right ends of the protection frames correspondingly, and the adjacent protection frames are in transmission connection, so that the protection frames can be folded and stretch out and draw back; two driving rotating mechanisms which are spaced up and down are arranged in the protective frame, are arranged on the upper side and the lower side of the rotating column and are used for driving the rotating column to rotate; an intermittent rotating mechanism is arranged in the protective frame, the intermittent rotating mechanism is in transmission connection with the driving rotating mechanism, and the intermittent rotating mechanism is used for driving the driving rotating mechanism to rotate; when guardrails with different functions are needed, the guardrails do not need to be disassembled and then installed, only the