Non-contact radar tunnel nondestructive testing fixed encoder device

The invention discloses a non-contact radar tunnel nondestructive detection fixed encoder device, belongs to the technical field of tunnel lining detection, and aims to solve the technical problem that when tunnel lining quality detection is carried out, wheels of existing detection operation vehicles with different sizes need to be fixed with encoders to complete distance information acquisition for radars. According to the technical scheme, the device comprises an encoder, an encoder wheel shaft, an existing detection operation vehicle bearing and an encoder fixing mechanism, the encoder fixing mechanism comprises hose clamps, a supporting foot plate and a disc, and at least two hose clamps which are arranged in a stacked mode are arranged above the disc; a gap is formed between every two adjacent hose clamps, and a plurality of supporting foot plates which are arranged at intervals are arranged on the outer edges of the hose clamps and the disc; the encoder wheel shaft is arranged in the center of the disc