The utility model discloses an anti-blocking dryer for a logging gas circuit. The anti-blocking device is mainly formed by connecting an anti-blocking device and a drying pipe through a connecting short hose. wherein a condensation ball is arranged in the anti-blocking device, the anti-blocking device is a conical anti-blocking device, the conical anti-blocking device is mainly composed of a top cover and a conical anti-blocking device cavity, the top cover is provided with an outlet nozzle connected with a short hose, and the bottom of the conical anti-blocking device cavity is provided withan inlet nozzle connected with a degasser gas outlet; the condensation ball is a hollow stainless steel ball and is arranged at the bottom of the conical anti-blocking device cavity, a spring is arranged in an inlet nozzle at the bottom of the conical anti-blocking device cavity, and the top of the spring extends out of the bottom of the conical anti-blocking device cavity to be matched with the condensation ball in a supporting mode. The gas inlet nozzle and the gas outlet nozzle on the drying pipe and the anti-blocking device are both of a drift diameter structure and are located on the samevertical line. According to the anti-blocking dryer for the logging gas circuit, the gas circuit blocking probability is reduced in comprehensive logging construction, the oil-gas display discovery rate is increased, the oil-gas evaluation effect based on comprehensive logging parameter display is improved, and meanwhile the use working condition is expanded.