Blood collection device for disease detection

The utility model discloses a blood collection device for disease detection. The blood collection device comprises an upper pressing block, a lower pressing block, a silica gel block, a connecting rod, a rack, a gear, a first linkage rod, a worm gear, a worm, a second linkage rod, a ratchet wheel, a ratchet, a telescopic spring, a pull rope, a clamping ring, a clamping block, a blood storage tube, an air bag, an inflation valve, a lifting valve, a needle tube, a rotary knob, a needle head and a mounting cavity. The device has the advantages that the second linkage rod is rotated to enable the worm gear and the worm to rotate, then the first linkage rods on the left side and the right side in the installation cavity are driven to rotate, the gears are driven to rotate, the connecting rods and the racks are driven to slide up and down in the installation cavity, and the opening and closing state between the upper pressing block and the lower pressing block is adjusted; the air bag is inflated through the inflat