The utility model relates to a thick film circuit used for a petrol logging telemeter to collect analog signals. A film block of the thick film circuit is in a rectangle shape including 36 spiculate pins arranged at two sides of the film block. An analog signal collecting circuit is arranged in the utility model and the circuit includes an active filter formed by 7 operational amplifiers U310 to U316 to carry through treatment on the analog quantities. The seven analog quantities after treated by the active filter enter a 16-way analog switch ADG506 to generate a control signal through being followed by a U306A and bing compared with a standard voltage of 592mV through a comparator U307A so as to control the output of an analog switch U10B, control the gain gating adjustment of an amplifier U360B and transmits the amplified signal into a 12 bit AD converter, thus solving the problems of complex circuit, low reliability and complex maintenance, etc., caused by various components of an apparatus and prolonging the service life of the apparatus and the precision of the logging data.