The invention discloses a toxic and harmful gas early warning and purification device for a chemical production workshop. The toxic and harmful gas early warning and purification device structurally comprises a chemical gas purification device, a gas filtering device, a display screen, a temperature sensor and a gas sensor, wherein the temperature sensor is arranged at the left side of the top ofthe chemical gas purification device; the gas sensor is arranged at the right part of the top of the chemical gas purification device; the display screen is arranged at the front part of the chemicalgas purification device; the gas filtering device is arranged at the bottom of the display screen; control keys are distributed at the right part of the display screen; warning devices are distributedat a side part of the chemical gas purification device; a control box is arranged in the middle of the bottom of the chemical gas purification device; water tanks are arranged at two sides of the control box; water spraying holes are distributed at the front parts of the water tanks; a fiber adhesive is distributed at the top of the back side of the chemical gas purification device. The toxic andharmful gas early warning and purification device for the chemical production workshop is used for effectively inducing toxic and harmful gas and filtering and purifying the toxic and harmful gas.