The invention relates to a dense-phase zone thermal transmission coefficient measuring apparatus comprising an outer pipe, an inner pipe, a thermocouple and discharging pipes; one end of the outer pipe is sealed, and an end cap is arranged on the other end of the outer pipe; the inner pipe penetrates through the end cap, and is arranged in the middle of the outer pipe; the end of the inner pipe in the outer pipe is close to the sealed end of the outer pipe; the discharging pipes penetrate through the end cap, and communicate with the inner cavity of the outer pipe; the number of the discharging pipes is at least two; the discharge pipes are uniformly aligned along the peripheral of the inner pipe with equal spaces; at least one groove is arranged axially on the outer wall of the outer pipe; the thermocouple is laid in the groove. According to requirements, the position of the thermocouple is adjusted by rotating a heat exchange pipe; and heat exchange coefficients under different bed depth and different heat exchange pipe circular angles can be calculated.