Injectable combined needle tube pen

The utility model belongs to the technical field of drawing stationery, and particularly relates to an injectable combined needle tube pen which comprises a pen body, a plurality of clamping grooves are formed in the tail end of the pen body, the clamping grooves are arranged at equal intervals in the circumferential direction, the clamping grooves are arranged in the length direction of the pen body, push-pull assemblies are slidably connected into the clamping grooves, and clamping devices are arranged on the clamping grooves. The push-pull assembly is connected with the clamping device in a clamped mode, needle tube refills are arranged at the bottom end of the push-pull assembly, the needle tube refills are located in the pen body and arranged in the length direction of the pen body, and the tail end of the pen body is detachably connected with a pen cap. Each needle tube refill comprises a needle tube, one end of the needle tube is detachably connected with a needle tube pen point, the needle tube pen po