A receiver coil loop for a magnetic resonance imaging system has a tuning loop for adjusting a tuning capacitor to make the tuning loop resonate at a center frequency a detuning loop for maintaining the receiver coil loop in a non-working state when the transmitter coil is emitting signals, and a matching loop for matching the tuning loop at the center frequency. The tuning loop and the detuning loop share a capacitor, and the tuning capacitor and the shared capacitor are connected in parallel. In such a receiver coil loop, the value of the tuning capacitor is reduced, the frequency tuning range of the tuning capacitor is broadened; the capacitive reactance generated by the entire circuit is reduced, and the tuning capacitor Ctuning is protected against breakdown under high voltage without increasing the loss of the circuit.