A movable base vibration detection test device comprises a motor, a crank, a suspension frame and a support. The support is composed of a left support body and a right support body, the motor is installed on the right support body, the suspension frame is arranged in the left support body, and a rail is placed in the suspension frame. A rotating shaft of the motor is connected with one end of a rotating rod through a coupler, the rotating rod is fixed to the left support through a bearing pedestal, and one end of a crank is fixedly connected to the other end of the rotating rod. The suspensionframe is rotationally connected to the other end of the crank, left-right rotation of the crank is achieved through a forward and reverse rotation control system in the motor, the crank drives the suspension frame to swing front and back, and therefore the rail vibrates and moves along the suspension frame, and vibration signals are collected through a vibration sensor located on the suspension frame. According to the utility model, a track low-frequency vibration signal driven by the motor can be obtained, the current vibration frequency can be directly obtained from the signal, the maximumamplitude of the current vibration frequency is estimated, and the pipe span section is positioned through the odometer or the inertial navigation system according to the time corresponding to the data.