The invention discloses a suction disk type local discharging ultrasonic transducer, which comprises a stainless steel case, an ultrasonic conditioning plate, an output connector, a connecting rod, a shielding cover, a sound isolation tube, a piezoelectric ceramic vibrator, a silicon rubber suction disk, a sealing baffle plate and a threaded silicon rubber outer wall, wherein the ultrasonic conditioning plate is arranged in the stainless steel case; the output connector is arranged on the stainless steel case; the front end of the stainless steel case is provided with the connecting rod; the shielding cover is connected with the connecting rod; the sound isolation tube is arranged in the shielding cover; the piezoelectric ceramic vibrator is arranged in a cavity of the sound isolation tube; the silicon rubber suction disk is arranged at the front end of the sound isolation tube; the threaded silicon rubber outer wall is connected with the stainless steel case; the sealing baffle plate, the threaded silicon rubber outer wall and the silicon rubber suction disk form a vacuum air chamber; the connecting rod penetrates through the sealing baffle plate to be connected with the shielding cover. The suction disk type local discharging ultrasonic transducer has high receiving sensitivity on ultrasonic waves; in addition, the electromagnetic interference resistance capability is high; the use is very convenient; the effective contact on high-voltage electric equipment outer walls which are made of various materials and are of different shapes can be ensured; the accurate monitoring is realized; in addition, the installation is convenient; the work efficiency is high.