The invention relates to the technical field of oral cavity medical equipment, in particular to a pen-type oral cavity laser therapeutic instrument. The pen-type oral cavity laser therapeutic instrument comprises a battery, a pen body, a key switch, a laser-emitting syringe needle, a control system, a laser drive circuit, a current-voltage conversion circuit, a laser device, an adjustment device and a display device. One end of the pen body is connected with the battery, the other end of the pen body is connected with the laser-emitting syringe needle, the key switch is arranged on the pen body, and the control system, the laser drive circuit, the laser device and the adjustment device are all arranged in the pen body. The pen-type oral cavity laser therapeutic instrument is small in size and convenient to carry; power of laser emitted by the medical equipment and laser-emitting modes can be adjusted according to actual demands of patients, the demands of various patients can be met, and the therapeutic effect is good.