The invention relates to a low-cost flame retardant splicing patient garment with a temperature detecting device. The low-cost flame retardant splicing patient garment with the temperature detecting device comprises a garment front part (1), a garment rear part (2) and two sleeves (3), the garment front part (1) and the garment rear part are connected through zippers (4), the sleeves (3) are connected with the garment front part (1) and the rear part through annular zippers (5), interlayers (6) are arranged at positions of armpits of the garment front part (1), an infrared temperature detector (7), a central processing unit (CPU) (8) and a global system for mobile communications (GSM) module (9) are disposed in the interlayers (6), the garment front part, the garment rear part and the sleeves are made of fabrics, the fabrics are formed by weaving of composite flame retardant yarns, and aramid fibers and flame retardant viscose are blended to cover outer surfaces of glass fiber core yarns to form the composite flame retardant yarns. Body temperature can be real-timely monitored by the low-cost flame retardant splicing patient garment with the temperature detecting device. The splicing patient garment with the temperature detecting device is low in costs and resistant to flame.