The invention relates to a track trolley for quenching experiments of thick plates and super-thick plates. The track trolley comprises an inclined track, a trolley, a foldable sample frame and a trolley driving mechanism. The inclined track is arranged in a quenching groove, the top of the inclined track is close to one side of a sample conveying roller, a carrier roller is arranged between the sample conveying roller and inclined track, the upper surface of the carrier roller is higher than that of the sample conveying roller, the trolley can run along the inclined track under the drive of the trolley driving mechanism, the foldable sample frame is arranged on the trolley and composed of a first bracket, a second bracket and folding mechanisms, the first bracket and the second bracket are connected through one folding mechanism, the second bracket and the trolley are connected through the other folding mechanism, unfolding and folding of the foldable sample frame in the sample conveying direction can be achieved, the sample bearing face of the foldable sample frame is a horizontal plane, and the horizontal plane makes four-point contact with a sample bottom face. According to the track trolley, the weight capacity is large, the bottom is basically suspended when the sample parallel liquid surface is subjected to immersion quenching experiments, sample hardenability is improved, and operation is convenient.