The invention provides a sand remover sand-removing early warning device which comprises a filter cartridge, a power distribution box, an acousto-optic alarm, a sand discharging pry and a sand discharging port, wherein an inlet pressure transmitter is arranged on the inlet pipe at the upper part of the filter cartridge, an outlet pressure transmitter is arranged on the outlet pipe at the upper endof the filter cartridge; the outlet pipe at the lower part of the filter cartridge is communicated with the sand discharging port through the sand discharging pry, an electric sand discharging valveis arranged on the pipe, the electric sand discharging valve is arranged in the sand discharging pry, the power distribution box is fixed on the upper part of the sand discharging pry, the acousto-optic alarm is arranged on the power distribution box, and the power distribution box is respectively electrically connected with the inlet pressure transmitter, the outlet pressure transmitter, the electric sand discharging valve and the acousto-optic alarm. Under a set open-close pressure difference value, a PLC controller controls the electric sand discharging valve to automatically open or closeaccording to the pressure difference of a filter net, and acousto-optic alarm reminding is performed.