The invention discloses an excrement analysis instrument, which comprises a case, wherein a base is arranged in the case; a sample tray, a sample feeding mechanism, a stirring and diluting mechanism,a sampling mechanism, a detection card conveying mechanism, a detection card division mechanism, a microscope mechanism, a reaction disc mechanism and a photo taking mechanism are arranged on the base; the detection card division mechanism comprises a rotatable division disc, a first card pushing assembly and a second card pushing assembly; the microscope mechanism, the detection card conveying mechanism and the reaction disc mechanism are arranged around the division disc; a plurality of first detection card positions are arranged on the division disc in the circumferential direction; the detection card conveying mechanism sequentially conveys the plurality of detection cards to the first detection card positions; the first card pushing assembly and the second card pushing assembly respectively push the detection cards at the first detection card positions into the microscope mechanism for microscopic examination and the reaction disc mechanism for reaction; the photo taking mechanismtakes photos on the characters of untreated samples and the detection results of the detection cards on the reaction disc mechanism. The excrement analysis instrument has the advantage that the detection efficiency and the detection precision are improved.