The invention provides a micro-bend bundle-tube type mass flowmeter which comprises a shell, two diversion bushes, a plurality of arched diversion tubes, a pair of arched flow tubes, a driving element and two detecting elements. The two diversion bushes are respectively connected to two ends of the shell. The diversion tubes are arranged in the shell, and both ends of the diversion tubes are communicated with the diversion bushes. The arched flow tubes are arranged in the shell, both ends of the flow tubes are communicated with the diversion bushes, the length of the flow tubes is equal to that of the diversion tubes. The driving element is fixed to the two flow tubes and arranged in the middle of the flow tubes, and is used for driving the same to vibrate. Each detecting element is fixed to the two flow tubes to detect vibration of the flow tubes; the detecting elements are arranged on two sides of the driving element. According to the micro-bend bundle-tube type mass flowmeter, diameter of the flow tubes for the Coriolis mass flow measurement can be decreased to the utmost extent on the premise of constant flow through arrangement of multiple tubes; thus, measuring error is reduced and measuring reliability is improved.