The invention discloses a semi-automatic drilling machine. The semi-automatic drilling machine comprises a base plate, a feeding mechanism, a positioning mechanism, a clamping mechanism, a drilling mechanism, a discharge mechanism and a transmission mechanism; the positioning mechanism is a cam connecting rod mechanism; the feeding mechanism and the positioning mechanism cooperate to realize positioning; the clamping mechanism is a cam connecting rod mechanism; the drilling mechanism drills clamped parts to be machined in a worktable drilling station; the discharge mechanism is a plane seven-rod mechanism; and the transmission mechanism comprises belt transmission and gear transmission. The semi-automatic drilling machine realizes a linear reciprocating motion of a feeding slide block, anintermittent linear reciprocating motion of a positioning rod, an intermittent linear reciprocating motion of a fixture, an intermittent linear reciprocating motion of a cutter and a discharge motionof the seven-rod discharge mechanism after machining, realizes structural simplification when guaranteeing the production efficiency, reduces the production and maintenance costs, saves the manpower and the like.