The invention discloses a monitoring system of a coal bed gas screw pump well, comprising a solar control device, a sensor, a multi-parameter recorder, a current transformer, an electric parameter collector, a wireless controller, a liquid level automatic monitor, a central control computer, a portable data acquisition unit and monitoring diagnosis software, wherein the multi-parameter recorder can be used for measuring the voltage and current parameters of the screw pump well through the current transformer and the electric parameter collector and computing the other electric parameters suchas the active power, the power factor and the like; and the data monitoring diagnosis software is arranged in the central control computer and used for receiving test data are received, forming a database, carrying out comprehensive analysis and diagnosis on the test parameters in the database and automatically describing the change conditions of the parameters of the coal bed gas well according to the historic data parameters. The historic recording curves of all the parameter data are expressed in a form of K line graph so that the parameter change of each well in each day and any period oftime can be checked conveniently.