The invention discloses a multifunctional detector used for blood detection and a blood detection method thereof. The multifunctional detector comprises a main body, a paper-out apparatus, a detectionapparatus, a marking apparatus, a detection marking port, a position sensor, a printer, a blood routine detector, a blood smearing instrument, and a processor, the paper-out apparatus is arranged ata front transverse plane of the top of the main body, the detection apparatus is positioned below the paper-out apparatus, the marking apparatus is positioned below the detection apparatus, a pedestalis arranged at the bottom of the front transverse plane of the main body, the blood smearing instrument is arranged at a rear part of the detection apparatus, the blood routine detector is arranged at the rear part of the blood smearing instrument, and the processor is positioned at the rear part of the marking apparatus. The multifunctional detector has the advantages of simple structure and lowcost, and is suitable for various hospitals, is simple in operation, can effectively reduce the workload of medical workers, and saves the medical worker time and patient clinic time.