The invention relates to a shear wave source device for a seismic exploration which comprises an extensible vibrator, a transmission device, a ball bearing, a surface bearing, a lifting column of adjustable pressure and a control device, wherein the extensible vibrator is used for generating mechanical excitation force parallel to the ground and conducting shear wave exploration; the transmission device transmits the excitation force generated by the extensible vibrator to a cutting board through a contact element; the ball bearing is used for conducting shifting in the excitation direction and acting on the mechanical bias voltage preset of the transmission device; a seismic source device is made to surround the center axis of the surface bearing to rotate so as to excite the shear wave in different directions; the lifting column moves upwards and downwards in the vertical direction of a conduit of the lifting column, the preset pressure is applied by adjusting the lifting column; the control device is connected with the extensible vibrator and a shake sensor arranged on the transmission device and used for detecting the accelerated speed of the transmission device through the shake sensor and controlling and driving the extensible vibrator to conduct shake excitation. The shear wave source device can generate shear waves through shake excitation and is used for shear wave seismic exploration.