Novel open type channel flowmeter

The utility model discloses a novel open channel flowmeter, which solves the problems of single function, low integration level, low measurement precision, complicated installation and debugging, inconvenience in maintenance and system reliability in open channel automatic monitoring, and comprises an upper cover, an upper shell is clamped at the bottom end of the upper cover, and a protective shell is sleeved at the bottom end of the upper shell. The protective shell comprises a first vertical pipe and a second vertical pipe, the bottom end of the first vertical pipe and the bottom end of the second vertical pipe are connected with a lower cover in a sliding mode, two fixing devices are arranged outside each of the first vertical pipe and the second vertical pipe, guide shells are arranged in each of the first vertical pipe and the second vertical pipe, a plurality of transducers are fixedly installed on the guide shells, and the upper cover, the lower cover and the protective shell are rectangular. Liquid l