The invention discloses a biological detector for rapid detection, which structurally comprises a base, a box body, a box door, a cavity, a placement base, a fixed pipe, a near infrared ray emission cover, a near infrared ray spectrometer, an air pump, a biological detector, an observation chamber, a motor, a telescopic rod, a sleeve, a sleeve pipe, a suction head and a partition plate, wherein the base is arranged at the bottom part of the box body, the cavity is formed in the box body, the box door is arranged in front of the cavity, the placement base is arranged at the bottom in the cavity, the biological detector is connected to the top part in the cavity, the bottom part of the biological detector is connected with the observation chamber, the side face of the observation chamber is communicated with the air pump through the air pipe, the bottom part of the observation chamber is connected with the top part of the fixing pipe, the middle of the fixing pipe penetrates through the partition plate, the bottom part of the fixing pipe is sleeved with the sleeve, the partition plate is connected into the cavity, and the bottom part of the sleeve is connected with the sleeve pipe. The biological detector has the beneficial effects that through cooperation of a starting structure and a cut-off device, food entering the suction head can be cut off, the food can be smoothly sucked upwards, and detection is smoother.