The utility model discloses a multichannel laser output apparatus and an MPO optical fiber connector testing device. The multichannel laser output apparatus comprises a constant current drive circuit, a temperature control circuit , a vertical cavity surface emitting laser (VCSEL) array and a refrigeration device, wherein the constant current drive circuit is used for driving the VCSEL array, the temperature control circuit is connected with the VCSEL array and the constant current drive circuit, the temperature control circuit is provided with a heat responsive device, both the heat responsive device and the refrigeration device cling to the surface of the VCSEL array, and the temperature control circuit is used for converting the temperature of the VCSEL array into an electrical signal and feeding the electrical signal back to the constant current drive circuit. With arrangement of the VCSEL array, the temperature control circuit and the refrigeration device, the multichannel laser output efficiency is raised, the cost is low, and the laser output is stable.