Auxiliary electric heating device for large water tank

An auxiliary electric heating device for a large water tank comprises an outer cylinder, a sleeve connector, a connector and an electric heating mechanism, the sleeve connector is in threaded connection with an inner thread at the inner bottom of the outer cylinder through an outer thread on the cylinder wall, the electric heating mechanism is an electric heating pipe, the top of the electric heating pipe is connected to the bottom of the connector, and the connector is in threaded connection with an inner thread of a penetrating hole of the sleeve connector through an outer thread. The electric heating pipes are connected with an external power supply through power lines. One end of the outer cylinder is open, the other end of the outer cylinder is connected with the sleeve connector used for fixing the electric heating pipe, one end of the electric heating pipe extends into water in a water tank, the electric heating pipe is kept in full contact with the water, a power line of the electric heating pipe is l