The utility model relates to a donkey semen thin-tube type insemination gun for a donkey. An existing thin-tube type insemination gun has the defects that only one donkey semen thin tube can be injected at a time, and the cost and workload are increased. Therefore, the insemination gun for the donkey comprises a sleeve and a push rod, wherein a sleeve head is connected to the front end of the sleeve, the inner end surface of the sleeve head is in an arc shape, a semen outlet hole is formed in the top of the inner end surface of the sleeve head, and a flange sleeves the back end of the sleeve; the front part of the push rod is inserted into the sleeve, a push handle is arranged on the back end of the push rod, push pins are arranged on the front end of the push rod, the push pins can be inserted into the donkey semen thin tube, one end of the donkey semen thin tube is sealed, and the other end of the donkey semen thin tube is a cotton plug end in which a cotton plug is plugged. The insemination gun for the donkey is characterized in that the number of the push pins is N, the front end of the push rod is an expansion part, the push pins are arranged on the expansion part, and the N is an integer and is larger than or equal to 3 and less than or equal to 8. The insemination gun for the donkey has the characteristics of high pregnancy rate, controllable semen volume, convenience in operation, cleanness and sanitation and is extremely suitable for artificial insemination of the donkey.