The invention relates to a seismic detector for a pull-type crawler, which comprises a shell and a grounding end connected with the front end of the shell and arranged outside a rubber belt track; the shell is arranged at the inside of the rubber belt track, and the grounding end and the shell are connected to be fixed on the rubber belt track; a detector core is rigidly fixed in the inner cavity of the shell and is closed by a thread end cover arranged at the tail end of the detector core; the bottom end of the detector core is provided with a signal lead; during seismic measuring, as the detector core body and the shell package are rigidly fixed and the shell of the detector and the ground form an absolute mass body, the detector can better measure the particle vibration of the earth surface. The seismic detector is suitable for the rigid packaging requirements between the shell and all vibration-type and other mechanical sensor core bodies. A contact, which is coupled with the ground, of the detector with the minitype structure is connected onto the mobile rubber belt track by threads, so the seismic detector is stable in work, reliable, efficient, suitable for various geological surfaces to carry out geophysical prospecting, low in manufacturing cost, simple and conveniently connected with a lower computer.